INFO: task syz-executor.4:18402 can't die for more than 143 seconds. task:syz-executor.4 state:D stack:27704 pid:18402 ppid: 8512 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4312 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5063 schedule+0xcf/0x270 kernel/sched/core.c:5142 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2204 do_new_mount_fc fs/namespace.c:2832 [inline] do_new_mount fs/namespace.c:2891 [inline] path_mount+0x1678/0x1e70 fs/namespace.c:3220 do_mount fs/namespace.c:3233 [inline] __do_sys_mount fs/namespace.c:3441 [inline] __se_sys_mount fs/namespace.c:3418 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3418 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007efca07cac68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000020002100 RSI: 00000000200020c0 RDI: 0000000000000000 RBP: 000000000119bfd0 R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffccf633a8f R14: 00007efca07cb9c0 R15: 000000000119bf8c INFO: task syz-executor.4:18402 blocked for more than 143 seconds. Not tainted 5.11.0-rc3-next-20210112-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27704 pid:18402 ppid: 8512 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4312 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5063 schedule+0xcf/0x270 kernel/sched/core.c:5142 rwsem_down_write_slowpath+0x7e5/0x1200 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x132/0x150 kernel/locking/rwsem.c:1407 inode_lock include/linux/fs.h:773 [inline] lock_mount+0x8a/0x2e0 fs/namespace.c:2204 do_new_mount_fc fs/namespace.c:2832 [inline] do_new_mount fs/namespace.c:2891 [inline] path_mount+0x1678/0x1e70 fs/namespace.c:3220 do_mount fs/namespace.c:3233 [inline] __do_sys_mount fs/namespace.c:3441 [inline] __se_sys_mount fs/namespace.c:3418 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3418 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 RSP: 002b:00007efca07cac68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e219 RDX: 0000000020002100 RSI: 00000000200020c0 RDI: 0000000000000000 RBP: 000000000119bfd0 R08: 0000000020002140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffccf633a8f R14: 00007efca07cb9c0 R15: 000000000119bf8c INFO: task syz-executor.4:18406 can't die for more than 144 seconds. task:syz-executor.4 state:R running task stack:25752 pid:18406 ppid: 8512 flags:0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1652: #0: ffffffff8b373ea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6254 1 lock held by in:imklog/8232: #0: ffff88801865f270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 2 locks held by kworker/u4:6/9103: #0: ffff8880b9e34fd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1319 [inline] #0: ffff8880b9e34fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x217/0x21a0 kernel/sched/core.c:4980 #1: ffffc9000256fda8 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250 1 lock held by syz-executor.4/18402: #0: ffff8880788a8150 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:773 [inline] #0: ffff8880788a8150 (&type->i_mutex_dir_key#9){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2204 2 locks held by syz-executor.4/18406: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1652 Comm: khungtaskd Not tainted 5.11.0-rc3-next-20210112-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+0x107/0x163 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+0xd89/0xf30 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8234 Comm: rs:main Q:Reg Not tainted 5.11.0-rc3-next-20210112-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0x5d/0x150 kernel/locking/lockdep.c:4921 Code: aa aa aa aa 48 2d 00 5c d4 8e 48 c1 f8 06 48 0f af c2 0f b7 57 20 81 e2 ff 1f 00 00 48 39 d0 0f 94 c0 0f b6 c0 48 83 c4 08 c3 <31> c0 c3 48 83 7f 18 00 75 c6 e8 b4 0c 00 00 85 c0 0f 84 a0 00 00 RSP: 0018:ffffc9000c1af470 EFLAGS: 00000046 RAX: 000000000000000a RBX: 0000000000000002 RCX: 1ffffffff1a084db RDX: 0000000000000000 RSI: ffffffff8b373de0 RDI: ffff88801419dde0 RBP: ffffffff8b373de0 R08: 0000000000000000 R09: ffffffff8d03f50f R10: fffffbfff1a07ea1 R11: 0000000000000100 R12: ffff88801419d400 R13: ffff88801419dd90 R14: 00000000ffffffff R15: ffff88801419dde0 FS: 00007ff1fa739700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f00dfd4d550 CR3: 000000001cbaa000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held kernel/locking/lockdep.c:5185 [inline] lock_is_held_type+0x7e/0x100 kernel/locking/lockdep.c:5476 lock_is_held include/linux/lockdep.h:271 [inline] rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125 trace_mm_page_alloc_zone_locked include/trace/events/kmem.h:256 [inline] trace_mm_page_alloc_zone_locked+0x16c/0x1c0 include/trace/events/kmem.h:256 __rmqueue mm/page_alloc.c:2891 [inline] rmqueue_bulk mm/page_alloc.c:2908 [inline] __rmqueue_pcplist mm/page_alloc.c:3419 [inline] rmqueue_pcplist mm/page_alloc.c:3447 [inline] rmqueue mm/page_alloc.c:3475 [inline] get_page_from_freelist+0x14aa/0x3f80 mm/page_alloc.c:3940 __alloc_pages_nodemask+0x2d6/0x730 mm/page_alloc.c:4993 alloc_pages_current+0x18c/0x2a0 mm/mempolicy.c:2270 alloc_pages include/linux/gfp.h:547 [inline] __page_cache_alloc mm/filemap.c:978 [inline] __page_cache_alloc+0x2ce/0x360 mm/filemap.c:963 pagecache_get_page+0x38f/0x18d0 mm/filemap.c:1811 grab_cache_page_write_begin+0x64/0x90 mm/filemap.c:3480 ext4_da_write_begin+0x35c/0x1150 fs/ext4/inode.c:2985 generic_perform_write+0x20a/0x4f0 mm/filemap.c:3530 ext4_buffered_write_iter+0x244/0x4d0 fs/ext4/file.c:270 ext4_file_write_iter+0x423/0x14d0 fs/ext4/file.c:664 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x791/0xa30 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7ff1fd17d1cd Code: c2 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ae fc ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 f7 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ff1fa738590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff1f000b980 RCX: 00007ff1fd17d1cd RDX: 0000000000000451 RSI: 00007ff1f000b980 RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007ff1f000b6e0 R13: 00007ff1fa7385b0 R14: 000055638ea9c440 R15: 0000000000000451