Hello, syzbot found the following issue on: HEAD commit: 27bb0b18c208 Merge tag 'linux-kselftest-kunit-fixes-5.17-r.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13c4f1cc700000 kernel config: https://syzkaller.appspot.com/x/.config?x=3e56c9b92aaaee24 dashboard link: https://syzkaller.appspot.com/bug?extid=be946efe33b2d9664348 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=154c5624700000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+be946efe33b2d9664348@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task udevd:3663 blocked for more than 143 seconds. Not tainted 5.17.0-rc2-syzkaller-00054-g27bb0b18c208 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:26280 pid: 3663 ppid: 2964 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4db0 kernel/sched/core.c:6295 schedule+0xd2/0x260 kernel/sched/core.c:6368 io_schedule+0xee/0x170 kernel/sched/core.c:8407 folio_wait_bit_common+0x4f2/0xa90 mm/filemap.c:1322 folio_wait_bit mm/filemap.c:1471 [inline] folio_wait_locked include/linux/pagemap.h:847 [inline] folio_wait_locked include/linux/pagemap.h:844 [inline] do_read_cache_folio+0x506/0x760 mm/filemap.c:3495 do_read_cache_page mm/filemap.c:3567 [inline] read_cache_page+0x59/0x1c0 mm/filemap.c:3576 read_mapping_page include/linux/pagemap.h:641 [inline] read_part_sector+0xf6/0x5b0 block/partitions/core.c:724 adfspart_check_ICS+0x9d/0xc90 block/partitions/acorn.c:360 check_partition block/partitions/core.c:148 [inline] blk_add_partitions block/partitions/core.c:609 [inline] bdev_disk_changed+0x629/0xf60 block/partitions/core.c:695 blkdev_get_whole+0x206/0x2d0 block/bdev.c:679 blkdev_get_by_dev.part.0+0x5c6/0xc70 block/bdev.c:813 blkdev_get_by_dev+0x6b/0x80 block/bdev.c:847 blkdev_open+0x154/0x2e0 block/fops.c:501 do_dentry_open+0x4b9/0x1240 fs/open.c:824 do_open fs/namei.c:3476 [inline] path_openat+0x1c9e/0x2940 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4d0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f27d7675697 RSP: 002b:00007ffc91e0e6e0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f27d8f5d4a0 RCX: 00007f27d7675697 RDX: 00000000000a0800 RSI: 00007f27d8f3f370 RDI: 00000000ffffff9c RBP: 00007f27d8f3f370 R08: 0000000000000001 R09: 00007ffc91fcb080 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800 R13: 00007f27d8f30940 R14: 0000000000000001 R15: 00007f27d8f222c0 </TASK> INFO: task syz-executor.0:3687 blocked for more than 143 seconds. Not tainted 5.17.0-rc2-syzkaller-00054-g27bb0b18c208 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28288 pid: 3687 ppid: 3667 flags:0x00000004 Call Trace: <TASK> context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4db0 kernel/sched/core.c:6295 schedule+0xd2/0x260 kernel/sched/core.c:6368 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6427 __mutex_lock_common kernel/locking/mutex.c:673 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733 blkdev_put+0x99/0x950 block/bdev.c:902 blkdev_close+0x6a/0x80 block/fops.c:515 __fput+0x286/0x9f0 fs/file_table.c:311 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7efd9b888c9b RSP: 002b:00007ffd940a8da0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007efd9b888c9b RDX: 0000001b30d20000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007efd9b9ea960 R08: 0000000000000000 R09: 00007ffd941ec080 R10: 00007ffd941ec090 R11: 0000000000000293 R12: 00000000001274c9 R13: 00007ffd940a8ea0 R14: 00007efd9b9e9030 R15: 0000000000000032 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8bb81120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460 5 locks held by kworker/u4:2/44: 2 locks held by getty/3273: #0: ffff88807f6b9098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002b5b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2077 1 lock held by udevd/3663: #0: ffff88801b222118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xc70 block/bdev.c:804 1 lock held by syz-executor.0/3687: #0: ffff88801b222118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x99/0x950 block/bdev.c:902 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.17.0-rc2-syzkaller-00054-g27bb0b18c208 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:369 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1154 Comm: kworker/0:3 Not tainted 5.17.0-rc2-syzkaller-00054-g27bb0b18c208 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:prep_new_page mm/page_alloc.c:2436 [inline] RIP: 0010:get_page_from_freelist+0xa8d/0x2f50 mm/page_alloc.c:4165 Code: 00 00 48 8b 7c 24 28 44 89 fe e8 6e 8d ff ff 8b 5c 24 14 83 e3 04 45 85 ff 0f 84 bd 18 00 00 f7 84 24 84 00 00 00 00 00 04 00 <0f> 85 76 19 00 00 85 db 0f 85 22 1a 00 00 48 8b 44 24 28 48 8d 78 RSP: 0018:ffffc900047c7838 EFLAGS: 00000006 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801d5c00c0 RSI: ffffffff81b4ee92 RDI: 0000000000000003 RBP: 000000000003d5f8 R08: 0000000000000002 R09: 0000000000000001 R10: ffffffff81c58582 R11: 000000000000001f R12: 0000000000000000 R13: dffffc0000000000 R14: ffff88813fffa700 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f46530a1600 CR3: 000000000b88e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389 __alloc_pages_node include/linux/gfp.h:572 [inline] kmem_getpages mm/slab.c:1378 [inline] cache_grow_begin+0x75/0x350 mm/slab.c:2584 cache_alloc_refill+0x27f/0x380 mm/slab.c:2957 ____cache_alloc mm/slab.c:3040 [inline] ____cache_alloc mm/slab.c:3023 [inline] slab_alloc_node mm/slab.c:3241 [inline] kmem_cache_alloc_node_trace+0x49c/0x5b0 mm/slab.c:3609 __do_kmalloc_node mm/slab.c:3631 [inline] __kmalloc_node_track_caller+0x38/0x60 mm/slab.c:3646 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1158 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:745 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:802 [inline] nsim_dev_trap_report_work+0x29a/0xbc0 drivers/net/netdevsim/dev.c:843 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 </TASK> ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 48 8b 7c 24 28 mov 0x28(%rsp),%rdi 7: 44 89 fe mov %r15d,%esi a: e8 6e 8d ff ff callq 0xffff8d7d f: 8b 5c 24 14 mov 0x14(%rsp),%ebx 13: 83 e3 04 and $0x4,%ebx 16: 45 85 ff test %r15d,%r15d 19: 0f 84 bd 18 00 00 je 0x18dc 1f: f7 84 24 84 00 00 00 testl $0x40000,0x84(%rsp) 26: 00 00 04 00 * 2a: 0f 85 76 19 00 00 jne 0x19a6 <-- trapping instruction 30: 85 db test %ebx,%ebx 32: 0f 85 22 1a 00 00 jne 0x1a5a 38: 48 8b 44 24 28 mov 0x28(%rsp),%rax 3d: 48 rex.W 3e: 8d .byte 0x8d 3f: 78 .byte 0x78 --- This report is generated by a bot. 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