Hello, syzbot found the following issue on: HEAD commit: 374a7f47bf40 Merge tag '6.5-rc5-ksmbd-server' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15c292d7a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=3e670757e16affb dashboard link: https://syzkaller.appspot.com/bug?extid=1422c4a798761a48ea4f compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-374a7f47.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3ea517da243c/vmlinux-374a7f47.xz kernel image: https://storage.googleapis.com/syzbot-assets/443cf2c4cd8a/bzImage-374a7f47.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1422c4a798761a48ea4f@xxxxxxxxxxxxxxxxxxxxxxxxx ====================================================== WARNING: possible circular locking dependency detected 6.5.0-rc5-syzkaller-00063-g374a7f47bf40 #0 Not tainted ------------------------------------------------------ syz-executor.0/10326 is trying to acquire lock: ffffffff8cb0c720 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:303 [inline] ffffffff8cb0c720 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:709 [inline] ffffffff8cb0c720 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3452 [inline] ffffffff8cb0c720 (fs_reclaim){+.+.}-{0:0}, at: __kmem_cache_alloc_node+0x51/0x350 mm/slub.c:3509 but task is already holding lock: ffff88802057dac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] ffff88802057dac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5809 [inline] ffff88802057dac8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x4a1/0x800 fs/ext4/inode.c:5890 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ei->xattr_sem){++++}-{3:3}: down_write+0x93/0x200 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_xattr_set_handle+0x167/0x14c0 fs/ext4/xattr.c:2371 __ext4_set_acl+0x362/0x5d0 fs/ext4/acl.c:217 ext4_set_acl+0x2c8/0x620 fs/ext4/acl.c:259 set_posix_acl+0x259/0x320 fs/posix_acl.c:956 vfs_remove_acl+0x2cd/0x620 fs/posix_acl.c:1243 ovl_do_remove_acl fs/overlayfs/overlayfs.h:300 [inline] ovl_workdir_create+0x4a1/0x820 fs/overlayfs/super.c:331 ovl_make_workdir fs/overlayfs/super.c:711 [inline] ovl_get_workdir fs/overlayfs/super.c:864 [inline] ovl_fill_super+0xdab/0x6180 fs/overlayfs/super.c:1400 vfs_get_super+0xf9/0x290 fs/super.c:1152 vfs_get_tree+0x88/0x350 fs/super.c:1519 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __ia32_sys_mount+0x291/0x310 fs/namespace.c:3861 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #2 (jbd2_handle){++++}-{0:0}: start_this_handle+0x1116/0x1600 fs/jbd2/transaction.c:463 jbd2__journal_start+0x391/0x690 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x40f/0x5c0 fs/ext4/ext4_jbd2.c:111 ext4_sample_last_mounted fs/ext4/file.c:863 [inline] ext4_file_open+0x632/0xc80 fs/ext4/file.c:892 do_dentry_open+0x88b/0x1780 fs/open.c:914 do_open fs/namei.c:3636 [inline] path_openat+0x19af/0x29c0 fs/namei.c:3793 do_filp_open+0x1de/0x430 fs/namei.c:3820 do_sys_openat2+0x176/0x1e0 fs/open.c:1407 do_sys_open fs/open.c:1422 [inline] __do_sys_openat fs/open.c:1438 [inline] __se_sys_openat fs/open.c:1433 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1433 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1494 [inline] sb_start_intwrite include/linux/fs.h:1616 [inline] ext4_evict_inode+0xe55/0x1a30 fs/ext4/inode.c:212 evict+0x2ed/0x6b0 fs/inode.c:665 iput_final fs/inode.c:1791 [inline] iput.part.0+0x55e/0x7a0 fs/inode.c:1817 iput+0x5c/0x80 fs/inode.c:1807 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 dentry_kill fs/dcache.c:745 [inline] dput+0x703/0xfd0 fs/dcache.c:913 ovl_stack_put fs/overlayfs/util.c:105 [inline] ovl_free_entry+0x8e/0xd0 fs/overlayfs/util.c:127 ovl_destroy_inode+0x6a/0x110 fs/overlayfs/super.c:176 destroy_inode+0xc4/0x1b0 fs/inode.c:310 iput_final fs/inode.c:1791 [inline] iput.part.0+0x55e/0x7a0 fs/inode.c:1817 iput+0x5c/0x80 fs/inode.c:1807 dentry_unlink_inode+0x292/0x430 fs/dcache.c:401 __dentry_kill+0x3b8/0x640 fs/dcache.c:607 shrink_dentry_list+0x235/0x7e0 fs/dcache.c:1201 prune_dcache_sb+0xeb/0x150 fs/dcache.c:1282 super_cache_scan+0x332/0x560 fs/super.c:104 do_shrink_slab+0x422/0xaa0 mm/vmscan.c:900 shrink_slab_memcg mm/vmscan.c:969 [inline] shrink_slab+0x48b/0x6e0 mm/vmscan.c:1048 shrink_one+0x4f7/0x700 mm/vmscan.c:5403 shrink_many mm/vmscan.c:5453 [inline] lru_gen_shrink_node mm/vmscan.c:5570 [inline] shrink_node+0x20c2/0x3730 mm/vmscan.c:6510 kswapd_shrink_node mm/vmscan.c:7315 [inline] balance_pgdat+0xa37/0x1b90 mm/vmscan.c:7505 kswapd+0x5be/0xbf0 mm/vmscan.c:7765 kthread+0x33a/0x430 kernel/kthread.c:389 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5144 lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726 __fs_reclaim_acquire mm/page_alloc.c:3602 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3616 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:709 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x51/0x350 mm/slub.c:3509 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc_node+0x4f/0x100 mm/slab_common.c:992 kmalloc_node include/linux/slab.h:602 [inline] kvmalloc_node+0x99/0x1a0 mm/util.c:604 kvmalloc include/linux/slab.h:720 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1535 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1577 [inline] ext4_xattr_set_entry+0x1c3d/0x3c70 fs/ext4/xattr.c:1719 ext4_xattr_block_set+0x678/0x30e0 fs/ext4/xattr.c:1970 ext4_xattr_move_to_block fs/ext4/xattr.c:2667 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2742 [inline] ext4_expand_extra_isize_ea+0x1306/0x1b20 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x342/0x470 fs/ext4/inode.c:5769 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5812 [inline] __ext4_mark_inode_dirty+0x52b/0x800 fs/ext4/inode.c:5890 __ext4_unlink+0x65e/0xcd0 fs/ext4/namei.c:3290 ext4_unlink+0x40b/0x580 fs/ext4/namei.c:3319 vfs_unlink+0x2f1/0x900 fs/namei.c:4329 do_unlinkat+0x3da/0x6d0 fs/namei.c:4395 __do_sys_unlinkat fs/namei.c:4438 [inline] __se_sys_unlinkat fs/namei.c:4431 [inline] __ia32_sys_unlinkat+0xc1/0x130 fs/namei.c:4431 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 other info that might help us debug this: Chain exists of: fs_reclaim --> jbd2_handle --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); lock(fs_reclaim); *** DEADLOCK *** 4 locks held by syz-executor.0/10326: #0: ffff88806fdf2410 (sb_writers#4){.+.+}-{0:0}, at: do_unlinkat+0x1ca/0x6d0 fs/namei.c:4376 #1: ffff888062214000 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:806 [inline] #1: ffff888062214000 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x27c/0x6d0 fs/namei.c:4380 #2: ffff88802057de00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:771 [inline] #2: ffff88802057de00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_unlink+0xd3/0x900 fs/namei.c:4318 #3: ffff88802057dac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] #3: ffff88802057dac8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5809 [inline] #3: ffff88802057dac8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x4a1/0x800 fs/ext4/inode.c:5890 stack backtrace: CPU: 0 PID: 10326 Comm: syz-executor.0 Not tainted 6.5.0-rc5-syzkaller-00063-g374a7f47bf40 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x311/0x3f0 kernel/locking/lockdep.c:2195 check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5144 lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726 __fs_reclaim_acquire mm/page_alloc.c:3602 [inline] fs_reclaim_acquire+0x11d/0x160 mm/page_alloc.c:3616 might_alloc include/linux/sched/mm.h:303 [inline] slab_pre_alloc_hook mm/slab.h:709 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x51/0x350 mm/slub.c:3509 __do_kmalloc_node mm/slab_common.c:984 [inline] __kmalloc_node+0x4f/0x100 mm/slab_common.c:992 kmalloc_node include/linux/slab.h:602 [inline] kvmalloc_node+0x99/0x1a0 mm/util.c:604 kvmalloc include/linux/slab.h:720 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1535 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1577 [inline] ext4_xattr_set_entry+0x1c3d/0x3c70 fs/ext4/xattr.c:1719 ext4_xattr_block_set+0x678/0x30e0 fs/ext4/xattr.c:1970 ext4_xattr_move_to_block fs/ext4/xattr.c:2667 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2742 [inline] ext4_expand_extra_isize_ea+0x1306/0x1b20 fs/ext4/xattr.c:2834 __ext4_expand_extra_isize+0x342/0x470 fs/ext4/inode.c:5769 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5812 [inline] __ext4_mark_inode_dirty+0x52b/0x800 fs/ext4/inode.c:5890 __ext4_unlink+0x65e/0xcd0 fs/ext4/namei.c:3290 ext4_unlink+0x40b/0x580 fs/ext4/namei.c:3319 vfs_unlink+0x2f1/0x900 fs/namei.c:4329 do_unlinkat+0x3da/0x6d0 fs/namei.c:4395 __do_sys_unlinkat fs/namei.c:4438 [inline] __se_sys_unlinkat fs/namei.c:4431 [inline] __ia32_sys_unlinkat+0xc1/0x130 fs/namei.c:4431 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f1e579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f195ac EFLAGS: 00000292 ORIG_RAX: 000000000000012d RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 00000000200003c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
