INFO: task syz-executor.5:16341 can't die for more than 143 seconds. task:syz-executor.5 state:D stack:27576 pid:16341 ppid: 8472 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 io_schedule+0xba/0x130 kernel/sched/core.c:7211 wait_on_page_bit_common+0x571/0xe90 mm/filemap.c:1274 wait_on_page_bit mm/filemap.c:1335 [inline] wait_on_page_locked include/linux/pagemap.h:675 [inline] wait_on_page_read mm/filemap.c:3247 [inline] do_read_cache_page+0x95c/0x1390 mm/filemap.c:3290 read_mapping_page include/linux/pagemap.h:500 [inline] find_target_block_classic fs/erofs/namei.c:105 [inline] erofs_namei+0x174/0x17a0 fs/erofs/namei.c:185 erofs_lookup fs/erofs/namei.c:229 [inline] erofs_lookup+0x29c/0x480 fs/erofs/namei.c:209 lookup_open.isra.0+0x84a/0x13d0 fs/namei.c:3197 open_last_lookups fs/namei.c:3289 [inline] path_openat+0x9b4/0x27e0 fs/namei.c:3495 do_filp_open+0x17e/0x3c0 fs/namei.c:3525 do_sys_openat2+0x16d/0x420 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_creat fs/open.c:1277 [inline] __se_sys_creat fs/open.c:1271 [inline] __x64_sys_creat+0xc9/0x120 fs/open.c:1271 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 RSP: 002b:00007fa578332188 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007fff9e18135f R14: 00007fa578332300 R15: 0000000000022000 INFO: task syz-executor.5:16341 blocked for more than 143 seconds. Not tainted 5.11.0-next-20210226-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:27576 pid:16341 ppid: 8472 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 io_schedule+0xba/0x130 kernel/sched/core.c:7211 wait_on_page_bit_common+0x571/0xe90 mm/filemap.c:1274 wait_on_page_bit mm/filemap.c:1335 [inline] wait_on_page_locked include/linux/pagemap.h:675 [inline] wait_on_page_read mm/filemap.c:3247 [inline] do_read_cache_page+0x95c/0x1390 mm/filemap.c:3290 read_mapping_page include/linux/pagemap.h:500 [inline] find_target_block_classic fs/erofs/namei.c:105 [inline] erofs_namei+0x174/0x17a0 fs/erofs/namei.c:185 erofs_lookup fs/erofs/namei.c:229 [inline] erofs_lookup+0x29c/0x480 fs/erofs/namei.c:209 lookup_open.isra.0+0x84a/0x13d0 fs/namei.c:3197 open_last_lookups fs/namei.c:3289 [inline] path_openat+0x9b4/0x27e0 fs/namei.c:3495 do_filp_open+0x17e/0x3c0 fs/namei.c:3525 do_sys_openat2+0x16d/0x420 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_creat fs/open.c:1277 [inline] __se_sys_creat fs/open.c:1271 [inline] __x64_sys_creat+0xc9/0x120 fs/open.c:1271 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 RSP: 002b:00007fa578332188 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007fff9e18135f R14: 00007fa578332300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1664: #0: ffffffff8bf741e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8220: #0: ffff8880204af770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 1 lock held by syz-executor.5/16341: #0: ffff88806a60c620 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #0: ffff88806a60c620 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3286 [inline] #0: ffff88806a60c620 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: path_openat+0x94e/0x27e0 fs/namei.c:3495 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1664 Comm: khungtaskd Not tainted 5.11.0-next-20210226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd8e/0xf40 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9652 Comm: kworker/0:6 Not tainted 5.11.0-next-20210226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:memset_erms+0xb/0x10 arch/x86/lib/memset_64.S:65 Code: 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3 aa <4c> 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 01 01 01 RSP: 0018:ffffc90015f77b40 EFLAGS: 00000206 RAX: dffffc00000000fb RBX: ffff88802715ca00 RCX: 0000000000000000 RDX: 000000000000001d RSI: 00000000000000fb RDI: ffffed1004e2b95d RBP: ffff88802715ca00 R08: 0000000000000140 R09: ffffed1004e2b940 R10: ffffffff813332fa R11: 000000000000003f R12: ffff8880114b6c80 R13: ffffffff81b6fdfb R14: ffff88802715ca00 R15: ffffc90015f77bd8 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbe97687000 CR3: 0000000023190000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ____kasan_slab_free mm/kasan/common.c:353 [inline] __kasan_slab_free+0xe8/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x72/0x1b0 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kmem_cache_free+0x8b/0x730 mm/slub.c:3177 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:683 __kfree_skb net/core/skbuff.c:740 [inline] consume_skb net/core/skbuff.c:895 [inline] consume_skb+0xcf/0x160 net/core/skbuff.c:889 nsim_dev_trap_report drivers/net/netdevsim/dev.c:586 [inline] nsim_dev_trap_report_work+0x86f/0xbd0 drivers/net/netdevsim/dev.c:611 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294