Re: possible deadlock in ext4_evict_inode

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On Thu, Sep 06, 2018 at 09:41:04AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    b36fdc6853a3 Merge tag 'gpio-v4.19-2' of git://git.kernel...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1716bc9e400000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=6c9564cd177daf0c
> dashboard link: https://syzkaller.appspot.com/bug?extid=0eefc1e06a77d327a056
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13db48be400000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+0eefc1e06a77d327a056@xxxxxxxxxxxxxxxxxxxxxxxxx

This looks like it's a Smack issue?

					- Ted

> 
> 8021q: adding VLAN 0 to HW filter on device team0
> 8021q: adding VLAN 0 to HW filter on device team0
> syz-executor0 (11193) used greatest stack depth: 15352 bytes left
> 
> ======================================================
> WARNING: possible circular locking dependency detected
> 4.19.0-rc2+ #1 Not tainted
> ------------------------------------------------------
> syz-executor3/11182 is trying to acquire lock:
> 00000000c157b042 (sb_internal){.+.+}, at: sb_start_intwrite
> include/linux/fs.h:1613 [inline]
> 00000000c157b042 (sb_internal){.+.+}, at: ext4_evict_inode+0x588/0x19b0
> fs/ext4/inode.c:250
> 
> but task is already holding lock:
> 00000000128cdd3b (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.98+0x0/0x30
> mm/page_alloc.c:463
> 
> which lock already depends on the new lock.
> 
> 
> the existing dependency chain (in reverse order) is:
> 
> -> #3 (fs_reclaim){+.+.}:
>        __fs_reclaim_acquire mm/page_alloc.c:3728 [inline]
>        fs_reclaim_acquire.part.98+0x24/0x30 mm/page_alloc.c:3739
>        fs_reclaim_acquire+0x14/0x20 mm/page_alloc.c:3740
>        slab_pre_alloc_hook mm/slab.h:418 [inline]
>        slab_alloc mm/slab.c:3378 [inline]
>        kmem_cache_alloc_trace+0x2d/0x730 mm/slab.c:3618
>        kmalloc include/linux/slab.h:513 [inline]
>        kzalloc include/linux/slab.h:707 [inline]
>        smk_fetch.part.24+0x5a/0xf0 security/smack/smack_lsm.c:273
>        smk_fetch security/smack/smack_lsm.c:3548 [inline]
>        smack_d_instantiate+0x946/0xea0 security/smack/smack_lsm.c:3502
>        security_d_instantiate+0x5c/0xf0 security/security.c:1287
>        d_instantiate+0x5e/0xa0 fs/dcache.c:1870
>        shmem_mknod+0x189/0x1f0 mm/shmem.c:2812
>        vfs_mknod+0x447/0x800 fs/namei.c:3719
>        handle_create+0x1ff/0x7c0 drivers/base/devtmpfs.c:211
>        handle drivers/base/devtmpfs.c:374 [inline]
>        devtmpfsd+0x27f/0x4c0 drivers/base/devtmpfs.c:400
>        kthread+0x35a/0x420 kernel/kthread.c:246
>        ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
> 
> -> #2 (&isp->smk_lock){+.+.}:
>        __mutex_lock_common kernel/locking/mutex.c:925 [inline]
>        __mutex_lock+0x171/0x1700 kernel/locking/mutex.c:1073
>        mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088
>        smack_d_instantiate+0x130/0xea0 security/smack/smack_lsm.c:3369
>        security_d_instantiate+0x5c/0xf0 security/security.c:1287
>        d_instantiate_new+0x7e/0x160 fs/dcache.c:1889
>        ext4_add_nondir+0x81/0x90 fs/ext4/namei.c:2415
>        ext4_symlink+0x761/0x1170 fs/ext4/namei.c:3162
>        vfs_symlink+0x37a/0x5d0 fs/namei.c:4127
>        do_symlinkat+0x242/0x2d0 fs/namei.c:4154
>        __do_sys_symlink fs/namei.c:4173 [inline]
>        __se_sys_symlink fs/namei.c:4171 [inline]
>        __x64_sys_symlink+0x59/0x80 fs/namei.c:4171
>        do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
>        entry_SYSCALL_64_after_hwframe+0x49/0xbe
> 
> -> #1 (jbd2_handle){++++}:
>        start_this_handle+0x5c0/0x1260 fs/jbd2/transaction.c:385
>        jbd2__journal_start+0x3c9/0x9f0 fs/jbd2/transaction.c:439
>        __ext4_journal_start_sb+0x18d/0x590 fs/ext4/ext4_jbd2.c:81
>        ext4_sample_last_mounted fs/ext4/file.c:414 [inline]
>        ext4_file_open+0x552/0x7b0 fs/ext4/file.c:439
>        do_dentry_open+0x499/0x1250 fs/open.c:771
>        vfs_open+0xa0/0xd0 fs/open.c:880
>        do_last fs/namei.c:3418 [inline]
>        path_openat+0x130f/0x5340 fs/namei.c:3534
>        do_filp_open+0x255/0x380 fs/namei.c:3564
>        do_open_execat+0x221/0x8e0 fs/exec.c:853
>        __do_execve_file.isra.35+0x1707/0x2460 fs/exec.c:1755
>        do_execveat_common fs/exec.c:1866 [inline]
>        do_execve fs/exec.c:1883 [inline]
>        __do_sys_execve fs/exec.c:1964 [inline]
>        __se_sys_execve fs/exec.c:1959 [inline]
>        __x64_sys_execve+0x8f/0xc0 fs/exec.c:1959
>        do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
>        entry_SYSCALL_64_after_hwframe+0x49/0xbe
> 
> -> #0 (sb_internal){.+.+}:
>        lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901
>        percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36
> [inline]
>        percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
>        __sb_start_write+0x1e9/0x300 fs/super.c:1387
>        sb_start_intwrite include/linux/fs.h:1613 [inline]
>        ext4_evict_inode+0x588/0x19b0 fs/ext4/inode.c:250
>        evict+0x4ae/0x990 fs/inode.c:558
>        iput_final fs/inode.c:1547 [inline]
>        iput+0x5fa/0xa00 fs/inode.c:1573
>        dentry_unlink_inode+0x461/0x5e0 fs/dcache.c:374
>        __dentry_kill+0x44c/0x7a0 fs/dcache.c:566
>        dentry_kill+0xc9/0x5a0 fs/dcache.c:685
>        shrink_dentry_list+0x36c/0x7c0 fs/dcache.c:1090
>        prune_dcache_sb+0x12f/0x1c0 fs/dcache.c:1171
>        super_cache_scan+0x270/0x480 fs/super.c:102
>        do_shrink_slab+0x4ba/0xbb0 mm/vmscan.c:536
>        shrink_slab_memcg mm/vmscan.c:601 [inline]
>        shrink_slab+0x6fe/0x8c0 mm/vmscan.c:674
>        shrink_node+0x429/0x16a0 mm/vmscan.c:2735
>        shrink_zones mm/vmscan.c:2964 [inline]
>        do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026
>        try_to_free_pages+0x4b2/0xa60 mm/vmscan.c:3241
>        __perform_reclaim mm/page_alloc.c:3769 [inline]
>        __alloc_pages_direct_reclaim mm/page_alloc.c:3790 [inline]
>        __alloc_pages_slowpath+0x95a/0x2cb0 mm/page_alloc.c:4191
>        __alloc_pages_nodemask+0xa1b/0xd10 mm/page_alloc.c:4390
>        __alloc_pages include/linux/gfp.h:473 [inline]
>        __alloc_pages_node include/linux/gfp.h:486 [inline]
>        kmem_getpages mm/slab.c:1409 [inline]
>        cache_grow_begin+0x91/0x710 mm/slab.c:2677
>        fallback_alloc+0x203/0x2c0 mm/slab.c:3219
>        ____cache_alloc_node+0x1c7/0x1e0 mm/slab.c:3287
>        slab_alloc_node mm/slab.c:3327 [inline]
>        kmem_cache_alloc_node_trace+0xe9/0x720 mm/slab.c:3661
>        __do_kmalloc_node mm/slab.c:3681 [inline]
>        __kmalloc_node+0x33/0x70 mm/slab.c:3689
>        kmalloc_node include/linux/slab.h:555 [inline]
>        kvmalloc_node+0xb9/0xf0 mm/util.c:423
>        kvmalloc include/linux/mm.h:577 [inline]
>        sem_alloc ipc/sem.c:497 [inline]
>        newary+0x244/0xb50 ipc/sem.c:527
>        ipcget_new ipc/util.c:315 [inline]
>        ipcget+0x15d/0x11d0 ipc/util.c:614
>        ksys_semget+0x1c0/0x280 ipc/sem.c:604
>        __do_sys_semget ipc/sem.c:609 [inline]
>        __se_sys_semget ipc/sem.c:607 [inline]
>        __x64_sys_semget+0x73/0xb0 ipc/sem.c:607
>        do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
>        entry_SYSCALL_64_after_hwframe+0x49/0xbe
> 
> other info that might help us debug this:
> 
> Chain exists of:
>   sb_internal --> &isp->smk_lock --> fs_reclaim
> 
>  Possible unsafe locking scenario:
> 
>        CPU0                    CPU1
>        ----                    ----
>   lock(fs_reclaim);
>                                lock(&isp->smk_lock);
>                                lock(fs_reclaim);
>   lock(sb_internal);
> 
>  *** DEADLOCK ***
> 
> 4 locks held by syz-executor3/11182:
>  #0: 000000000ed49aa7 (&ids->rwsem){+.+.}, at: ipcget_new ipc/util.c:314
> [inline]
>  #0: 000000000ed49aa7 (&ids->rwsem){+.+.}, at: ipcget+0x125/0x11d0
> ipc/util.c:614
>  #1: 00000000128cdd3b (fs_reclaim){+.+.}, at:
> fs_reclaim_acquire.part.98+0x0/0x30 mm/page_alloc.c:463
>  #2: 00000000c7d74038 (shrinker_rwsem){++++}, at: shrink_slab_memcg
> mm/vmscan.c:578 [inline]
>  #2: 00000000c7d74038 (shrinker_rwsem){++++}, at: shrink_slab+0x1d1/0x8c0
> mm/vmscan.c:674
>  #3: 00000000a3e33771 (&type->s_umount_key#28){++++}, at:
> trylock_super+0x22/0x110 fs/super.c:412
> 
> stack backtrace:
> CPU: 1 PID: 11182 Comm: syz-executor3 Not tainted 4.19.0-rc2+ #1
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
>  print_circular_bug.isra.34.cold.55+0x1bd/0x27d
> kernel/locking/lockdep.c:1222
>  check_prev_add kernel/locking/lockdep.c:1862 [inline]
>  check_prevs_add kernel/locking/lockdep.c:1975 [inline]
>  validate_chain kernel/locking/lockdep.c:2416 [inline]
>  __lock_acquire+0x3449/0x5020 kernel/locking/lockdep.c:3412
>  lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901
>  percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
>  percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
>  __sb_start_write+0x1e9/0x300 fs/super.c:1387
>  sb_start_intwrite include/linux/fs.h:1613 [inline]
>  ext4_evict_inode+0x588/0x19b0 fs/ext4/inode.c:250
>  evict+0x4ae/0x990 fs/inode.c:558
>  iput_final fs/inode.c:1547 [inline]
>  iput+0x5fa/0xa00 fs/inode.c:1573
>  dentry_unlink_inode+0x461/0x5e0 fs/dcache.c:374
>  __dentry_kill+0x44c/0x7a0 fs/dcache.c:566
>  dentry_kill+0xc9/0x5a0 fs/dcache.c:685
>  shrink_dentry_list+0x36c/0x7c0 fs/dcache.c:1090
>  prune_dcache_sb+0x12f/0x1c0 fs/dcache.c:1171
>  super_cache_scan+0x270/0x480 fs/super.c:102
>  do_shrink_slab+0x4ba/0xbb0 mm/vmscan.c:536
>  shrink_slab_memcg mm/vmscan.c:601 [inline]
>  shrink_slab+0x6fe/0x8c0 mm/vmscan.c:674
>  shrink_node+0x429/0x16a0 mm/vmscan.c:2735
>  shrink_zones mm/vmscan.c:2964 [inline]
>  do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026
>  try_to_free_pages+0x4b2/0xa60 mm/vmscan.c:3241
>  __perform_reclaim mm/page_alloc.c:3769 [inline]
>  __alloc_pages_direct_reclaim mm/page_alloc.c:3790 [inline]
>  __alloc_pages_slowpath+0x95a/0x2cb0 mm/page_alloc.c:4191
>  __alloc_pages_nodemask+0xa1b/0xd10 mm/page_alloc.c:4390
>  __alloc_pages include/linux/gfp.h:473 [inline]
>  __alloc_pages_node include/linux/gfp.h:486 [inline]
>  kmem_getpages mm/slab.c:1409 [inline]
>  cache_grow_begin+0x91/0x710 mm/slab.c:2677
>  fallback_alloc+0x203/0x2c0 mm/slab.c:3219
>  ____cache_alloc_node+0x1c7/0x1e0 mm/slab.c:3287
>  slab_alloc_node mm/slab.c:3327 [inline]
>  kmem_cache_alloc_node_trace+0xe9/0x720 mm/slab.c:3661
>  __do_kmalloc_node mm/slab.c:3681 [inline]
>  __kmalloc_node+0x33/0x70 mm/slab.c:3689
>  kmalloc_node include/linux/slab.h:555 [inline]
>  kvmalloc_node+0xb9/0xf0 mm/util.c:423
>  kvmalloc include/linux/mm.h:577 [inline]
>  sem_alloc ipc/sem.c:497 [inline]
>  newary+0x244/0xb50 ipc/sem.c:527
>  ipcget_new ipc/util.c:315 [inline]
>  ipcget+0x15d/0x11d0 ipc/util.c:614
>  ksys_semget+0x1c0/0x280 ipc/sem.c:604
>  __do_sys_semget ipc/sem.c:609 [inline]
>  __se_sys_semget ipc/sem.c:607 [inline]
>  __x64_sys_semget+0x73/0xb0 ipc/sem.c:607
>  do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x457099
> Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
> 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff
> 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007fbecf217c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000040
> RAX: ffffffffffffffda RBX: 00007fbecf2186d4 RCX: 0000000000457099
> RDX: 0000000000000000 RSI: 0000000000004007 RDI: 0000000000000000
> RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
> R13: 00000000004d4740 R14: 00000000004c8d3e R15: 0000000000000000
> syz-executor4 (11186) used greatest stack depth: 15080 bytes left
> syz-executor7 (11171) used greatest stack depth: 14344 bytes left
> syz-executor2 (11260) used greatest stack depth: 14296 bytes left
> syz-executor0 invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE),
> nodemask=(null), order=0, oom_score_adj=0
> syz-executor0 cpuset=syz0 mems_allowed=0
> CPU: 0 PID: 11308 Comm: syz-executor0 Not tainted 4.19.0-rc2+ #1
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
>  dump_header+0x27b/0xf70 mm/oom_kill.c:441
>  oom_kill_process.cold.28+0x10/0x95a mm/oom_kill.c:953
>  out_of_memory+0xa88/0x1430 mm/oom_kill.c:1120
>  __alloc_pages_may_oom mm/page_alloc.c:3522 [inline]
>  __alloc_pages_slowpath+0x223f/0x2cb0 mm/page_alloc.c:4235
>  __alloc_pages_nodemask+0xa1b/0xd10 mm/page_alloc.c:4390
>  alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2093
>  alloc_pages include/linux/gfp.h:509 [inline]
>  __page_cache_alloc+0x398/0x5e0 mm/filemap.c:946
>  page_cache_read mm/filemap.c:2385 [inline]
>  filemap_fault+0x1458/0x2220 mm/filemap.c:2569
>  ext4_filemap_fault+0x82/0xad fs/ext4/inode.c:6257
>  __do_fault+0xee/0x450 mm/memory.c:3240
>  do_read_fault mm/memory.c:3652 [inline]
>  do_fault mm/memory.c:3752 [inline]
>  handle_pte_fault mm/memory.c:3983 [inline]
>  __handle_mm_fault+0x2b4a/0x4350 mm/memory.c:4107
>  handle_mm_fault+0x53e/0xc80 mm/memory.c:4144
>  __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1395
>  do_page_fault+0xf6/0x7a4 arch/x86/mm/fault.c:1470
>  page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1161
> RIP: 0033:0x40a056
> Code: Bad RIP value.
> RSP: 002b:00007ffd766513d0 EFLAGS: 00010283
> RAX: 0000000000730a08 RBX: 00000000009300a0 RCX: 0000000000000001
> RDX: 0000000000000001 RSI: ffffffffffffffff RDI: 00000000004bce88
> RBP: 00000000009300a0 R08: 0000000000000009 R09: 0000000000000001
> R10: 00007ffd766514d0 R11: 0000000000000000 R12: 0000000000930aa0
> R13: 000000000093014c R14: 000000000001f9ab R15: 000000000001f97e
> Mem-Info:
> active_anon:4715 inactive_anon:367 isolated_anon:0
>  active_file:31 inactive_file:10 isolated_file:0
>  unevictable:0 dirty:0 writeback:0 unstable:0
>  slab_reclaimable:11145 slab_unreclaimable:1533913
>  mapped:177 shmem:377 pagetables:511 bounce:0
>  free:24282 free_pcp:0 free_cma:0
> Node 0 active_anon:18860kB inactive_anon:1468kB active_file:116kB
> inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):56kB
> mapped:708kB dirty:0kB writeback:0kB shmem:1508kB shmem_thp: 0kB
> shmem_pmdmapped: 0kB anon_thp: 6144kB writeback_tmp:0kB unstable:0kB
> all_unreclaimable? yes
> Node 0 DMA free:15908kB min:164kB low:204kB high:244kB active_anon:0kB
> inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB
> writepending:0kB present:15992kB managed:15908kB mlocked:0kB
> kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB
> free_cma:0kB
> lowmem_reserve[]: 0 2842 6348 6348
> Node 0 DMA32 free:44052kB min:30180kB low:37724kB high:45268kB
> active_anon:2056kB inactive_anon:0kB active_file:40kB inactive_file:72kB
> unevictable:0kB writepending:0kB present:3129292kB managed:2914192kB
> mlocked:0kB kernel_stack:32kB pagetables:0kB bounce:0kB free_pcp:0kB
> local_pcp:0kB free_cma:0kB
> lowmem_reserve[]: 0 0 3506 3506
> Node 0 Normal free:37168kB min:37236kB low:46544kB high:55852kB
> active_anon:16804kB inactive_anon:1468kB active_file:176kB inactive_file:0kB
> unevictable:0kB writepending:0kB present:4718592kB managed:3590864kB
> mlocked:0kB kernel_stack:5216kB pagetables:2044kB bounce:0kB free_pcp:0kB
> local_pcp:0kB free_cma:0kB
> lowmem_reserve[]: 0 0 0 0
> Node 0 DMA: 1*4kB (U) 0*8kB 0*16kB 1*32kB (U) 2*64kB (U) 1*128kB (U) 1*256kB
> (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15908kB
> Node 0 DMA32: 5*4kB (ME) 7*8kB (UME) 4*16kB (ME) 4*32kB (ME) 4*64kB (ME)
> 2*128kB (UE) 4*256kB (UME) 3*512kB (ME) 4*1024kB (UME) 4*2048kB (UME)
> 7*4096kB (M) = 44300kB
> Node 0 Normal: 867*4kB (UME) 448*8kB (M) 250*16kB (ME) 106*32kB (ME) 51*64kB
> (ME) 46*128kB (ME) 20*256kB (M) 15*512kB (M) 1*1024kB (E) 0*2048kB 0*4096kB
> = 37420kB
> Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0
> hugepages_size=2048kB
> 424 total pagecache pages
> 0 pages in swap cache
> Swap cache stats: add 0, delete 0, find 0/0
> Free swap  = 0kB
> Total swap = 0kB
> 1965969 pages RAM
> 0 pages HighMem/MovableOnly
> 335728 pages reserved
> Unreclaimable slab info:
> Name                      Used          Total
> pid_2                    131KB        156KB
> TIPC                      12KB         14KB
> SCTPv6                    18KB         24KB
> DCCPv6                    21KB         29KB
> DCCP                      20KB         27KB
> bridge_fdb_cache          15KB         19KB
> fib6_nodes               103KB        108KB
> ip6_dst_cache            113KB        300KB
> RAWv6                     87KB         91KB
> UDPv6                      3KB          3KB
> TCPv6                     29KB         29KB
> nf_conntrack               2KB          3KB
> sd_ext_cdb                 0KB          3KB
> scsi_sense_cache        1056KB       1060KB
> virtio_scsi_cmd           16KB         16KB
> sgpool-128                 8KB          8KB
> sgpool-64                  4KB          6KB
> sgpool-32                  2KB          7KB
> sgpool-16                  1KB          3KB
> sgpool-8                   0KB          3KB
> mqueue_inode_cache         12KB         21KB
> bio_post_read_ctx         14KB         15KB
> bio-2                     14KB         15KB
> jfs_mp                     7KB          7KB
> nfs_commit_data            3KB          7KB
> nfs_write_data            34KB         37KB
> jbd2_inode                 2KB          3KB
> ext4_system_zone           0KB          3KB
> bio-1                      1KB          3KB
> pid_namespace              2KB          7KB
> rpc_buffers               17KB         19KB
> rpc_tasks                  2KB          3KB
> UNIX                      12KB         47KB
> tcp_bind_bucket            1KB          4KB
> ip_fib_trie               14KB         19KB
> ip_fib_alias              69KB         71KB
> ip_dst_cache               0KB          8KB
> RAW                       51KB         57KB
> UDP                       19KB         39KB
> TCP                        5KB          5KB
> hugetlbfs_inode_cache          1KB          7KB
> fscache_cookie_jar          0KB          7KB
> eventpoll_pwq             51KB         51KB
> eventpoll_epi             90KB         90KB
> inotify_inode_mark         90KB         90KB
> request_queue            159KB        159KB
> blkdev_requests            1KB          3KB
> blkdev_ioc                23KB         23KB
> bio-0                    536KB        536KB
> biovec-max              1658KB       1658KB
> biovec-64                401KB        401KB
> biovec-16                127KB        127KB
> bio_integrity_payload          1KB          4KB
> khugepaged_mm_slot         27KB         27KB
> dmaengine-unmap-2          0KB          3KB
> skbuff_fclone_cache          1KB         18KB
> skbuff_head_cache        673KB       1916KB
> configfs_dir_cache          0KB          4KB
> file_lock_cache            1KB          7KB
> file_lock_ctx              0KB          3KB
> fsnotify_mark_connector         51KB         51KB
> net_namespace             69KB         69KB
> shmem_inode_cache       3043KB       3043KB
> task_delay_info          125KB        371KB
> taskstats                176KB        176KB
> proc_dir_entry           680KB        682KB
> pde_opener                 0KB          3KB
> seq_file                 362KB        362KB
> sigqueue                 126KB        401KB
> kernfs_node_cache      11279KB      11284KB
> mnt_cache                 85KB        108KB
> filp                    4848KB       8073KB
> names_cache           121567KB     121567KB
> inode_smack             4817KB       4817KB
> key_jar                    3KB          7KB
> uts_namespace              3KB          7KB
> nsproxy                    1KB          7KB
> vm_area_struct          8830KB      12970KB
> mm_struct               1462KB       3614KB
> fs_cache                 161KB        496KB
> files_cache              538KB       1256KB
> signal_cache             915KB       2185KB
> sighand_cache            395KB        395KB
> task_struct             3249KB       3304KB
> cred_jar                 795KB       2348KB
> anon_vma_chain          4757KB       6000KB
> anon_vma                 237KB        392KB
> pid                       73KB        228KB
> Acpi-Operand             312KB        772KB
> Acpi-Namespace           102KB        104KB
> numa_policy                0KB          3KB
> debug_objects_cache       1125KB       1126KB
> trace_event_file         243KB        247KB
> ftrace_event_field        348KB        350KB
> pool_workqueue            67KB         72KB
> task_group                 7KB          7KB
> page->ptl               1564KB       3300KB
> kmalloc-4194304      5713920KB    5713920KB
> kmalloc-2097152         2050KB       2050KB
> kmalloc-524288          2056KB       2056KB
> kmalloc-262144          1290KB       1290KB
> kmalloc-131072           650KB        650KB
> kmalloc-65536            330KB        330KB
> kmalloc-32768            891KB        990KB
> kmalloc-16384            412KB        462KB
> kmalloc-8192            2004KB       2004KB
> kmalloc-4096           18670KB      18708KB
> kmalloc-2048            6464KB       7764KB
> kmalloc-1024            4572KB       5244KB
> kmalloc-512             3885KB       5812KB
> kmalloc-256             4762KB       4762KB
> kmalloc-128              901KB        901KB
> kmalloc-96              1935KB       2112KB
> kmalloc-64              1843KB       1896KB
> kmalloc-32              1849KB       1956KB
> kmalloc-192             2706KB       4076KB
> kmem_cache               221KB        221KB
> Tasks state (memory values in pages):
> [  pid  ]   uid  tgid total_vm      rss pgtables_bytes swapents
> oom_score_adj name
> [   2347]     0  2347      278      186    32768        0             0 none
> [   2539]     0  2539     5377      170    86016        0         -1000
> udevd
> [   2754]     0  2754     5376      171    81920        0         -1000
> udevd
> [   4381]     0  4381     2493      573    65536        0             0
> dhclient
> [   4544]     0  4544    14267      155   118784        0             0
> rsyslogd
> [   4587]     0  4587     4725       49    86016        0             0 cron
> [   4613]     0  4613    12490      153   139264        0         -1000 sshd
> [   4638]     0  4638     3694       42    69632        0             0
> getty
> [   4639]     0  4639     3694       39    77824        0             0
> getty
> [   4640]     0  4640     3694       41    77824        0             0
> getty
> [   4641]     0  4641     3694       41    77824        0             0
> getty
> [   4642]     0  4642     3694       39    73728        0             0
> getty
> [   4643]     0  4643     3694       40    77824        0             0
> getty
> [   4644]     0  4644     3649       41    73728        0             0
> getty
> [   4645]     0  4645     5310      115    81920        0         -1000
> udevd
> [   4663]     0  4663    17821      198   188416        0             0 sshd
> [   4665]     0  4665    41970     1817   163840        0             0
> syz-execprog
> [   4676]     0  4676     9360       15    40960        0             0
> syz-executor4
> [   4678]     0  4678     9360       15    40960        0             0
> syz-executor5
> [   4677]     0  4677     9359       22    49152        0             0
> syz-executor4
> [   4681]     0  4681     9360       15    40960        0             0
> syz-executor3
> [   4682]     0  4682     9360       15    40960        0             0
> syz-executor0
> [   4683]     0  4683     9359       21    49152        0             0
> syz-executor5
> [   4685]     0  4685     9360       15    40960        0             0
> syz-executor7
> [   4686]     0  4686     9359       22    49152        0             0
> syz-executor3
> [   4687]     0  4687     9360       15    40960        0             0
> syz-executor6
> [   4688]     0  4688     9359       22    49152        0             0
> syz-executor0
> [   4689]     0  4689     9359       21    49152        0             0
> syz-executor7
> [   4690]     0  4690     9360       15    40960        0             0
> syz-executor2
> [   4691]     0  4691     9359       22    49152        0             0
> syz-executor6
> [   4692]     0  4692     9360       14    40960        0             0
> syz-executor1
> [   4693]     0  4693     9359       22    49152        0             0
> syz-executor2
> [   4694]     0  4694     9359       21    53248        0             0
> syz-executor1
> [   6704]     0  6704     5310      115    81920        0         -1000
> udevd
> [   6710]     0  6710     5310      115    81920        0         -1000
> udevd
> [   6737]     0  6737     5376      171    81920        0         -1000
> udevd
> [   6804]     0  6804     5376      172    81920        0         -1000
> udevd
> [   6819]     0  6819     5376      172    81920        0         -1000
> udevd
> [   7149]     0  7149     5376      172    81920        0         -1000
> udevd
> [  11308]     0 11308     9425       22    61440        0             0
> syz-executor0
> [  11311]     0 11311     9425      534    61440        0             0
> syz-executor6
> Out of memory: Kill process 4665 (syz-execprog) score 1 or sacrifice child
> Killed process 4676 (syz-executor4) total-vm:37440kB, anon-rss:60kB,
> file-rss:0kB, shmem-rss:0kB
> syz-executor0 (11308) used greatest stack depth: 14040 bytes left
> device bridge_slave_1 left promiscuous mode
> bridge0: port 2(bridge_slave_1) entered disabled state
> device bridge_slave_0 left promiscuous mode
> bridge0: port 1(bridge_slave_0) entered disabled state
> team0 (unregistering): Port device team_slave_1 removed
> IPVS: ftp: loaded support on port[0] = 21
> team0 (unregistering): Port device team_slave_0 removed
> bond0 (unregistering): Releasing backup interface bond_slave_1
> bond0 (unregistering): Releasing backup interface bond_slave_0
> bond0 (unregistering): Released all slaves
> bridge0: port 1(bridge_slave_0) entered blocking state
> bridge0: port 1(bridge_slave_0) entered disabled state
> device bridge_slave_0 entered promiscuous mode
> bridge0: port 2(bridge_slave_1) entered blocking state
> bridge0: port 2(bridge_slave_1) entered disabled state
> device bridge_slave_1 entered promiscuous mode
> IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
> IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
> bond0: Enslaving bond_slave_0 as an active interface with an up link
> bond0: Enslaving bond_slave_1 as an active interface with an up link
> IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready
> team0: Port device team_slave_0 added
> IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready
> team0: Port device team_slave_1 added
> IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
> IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
> IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
> IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
> IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready
> IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
> IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready
> IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
> bridge0: port 2(bridge_slave_1) entered blocking state
> bridge0: port 2(bridge_slave_1) entered forwarding state
> bridge0: port 1(bridge_slave_0) entered blocking state
> bridge0: port 1(bridge_slave_0) entered forwarding state
> IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
> 8021q: adding VLAN 0 to HW filter on device bond0
> IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
> IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
> IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
> IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready
> 8021q: adding VLAN 0 to HW filter on device team0
> IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready
> 
> 
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
> 
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
> syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches



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