INFO: task segctord:14563 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. segctord D30376 14563 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3aa/0x760 kernel/locking/rwsem-xadd.c:618 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:72 nilfs_transaction_lock+0x1fb/0x8b0 fs/nilfs2/segment.c:362 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2479 [inline] nilfs_segctor_thread+0x3c0/0xf50 fs/nilfs2/segment.c:2563 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 1 lock held by khungtaskd/1571: #0: 0000000017488ccf (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7811: 6 locks held by syz-executor.0/14555: 1 lock held by segctord/14563: #0: 00000000e724a933 (&nilfs->ns_segctor_sem){++++}, at: nilfs_transaction_lock+0x1fb/0x8b0 fs/nilfs2/segment.c:362 2 locks held by syz-executor.2/24861: #0: 000000007d2da2ae (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 000000007d2da2ae (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 #1: 0000000017488ccf (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 0000000017488ccf (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 1 lock held by syz-executor.2/24870: #0: 000000008c4d89ef (&type->s_umount_key#92){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.2/24873: #0: 000000008c4d89ef (&type->s_umount_key#92){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.3/24868: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 24868 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:324 [inline] RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:344 [inline] RIP: 0010:trace_hrtimer_cancel include/trace/events/timer.h:285 [inline] RIP: 0010:debug_deactivate kernel/time/hrtimer.c:472 [inline] RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1435 [inline] RIP: 0010:__hrtimer_run_queues+0x1f6/0xe60 kernel/time/hrtimer.c:1527 Code: 8b 1d be 53 ad 7e bf 07 00 00 00 89 de e8 62 59 0e 00 83 fb 07 0f 87 ac 09 00 00 e8 e4 57 0e 00 89 db 48 0f a3 1d c2 b1 d2 09 <0f> 92 c3 31 ff 89 de e8 fe 58 0e 00 84 db 0f 85 41 08 00 00 e8 c1 RSP: 0018:ffff8880ba107e00 EFLAGS: 00000007 RAX: ffff88809d57c280 RBX: 0000000000000001 RCX: ffffffff81542d7e RDX: 0000000000010000 RSI: ffffffff81542d8c RDI: 0000000000000005 RBP: 000000db3be80ef1 R08: 0000000000000000 R09: 0000000000000007 R10: 0000000000000005 R11: ffffffff8c66505b R12: 0000000000000086 R13: ffff888045865658 R14: ffff8880ba124d40 R15: dffffc0000000000 FS: 00007fd162a19700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000016c0600 CR3: 0000000040ead000 CR4: 00000000003426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x20 kernel/kcov.c:162 Code: b6 d6 40 0f b6 f7 31 ff eb 80 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 02 00 00 00 e9 6c ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 <48> 8b 0c 24 89 f2 89 fe bf 04 00 00 00 e9 4e ff ff ff 66 66 2e 0f RSP: 0018:ffff8880467f7848 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000005 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000003 RBP: ffff8880b48b2f0b R08: 0000000000000001 R09: 0000000000000002 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000007 R13: 0000000000000008 R14: 0000000000000003 R15: ffff8880b48b2f0d num_to_str+0x14c/0x2d0 lib/vsprintf.c:384 seq_put_decimal_ull_width+0x22f/0x390 fs/seq_file.c:703 task_mem+0x3cd/0x5d0 fs/proc/task_mmu.c:67 proc_pid_status+0xfac/0x23e0 fs/proc/array.c:407 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 do_preadv fs/read_write.c:1071 [inline] __do_sys_preadv fs/read_write.c:1121 [inline] __se_sys_preadv fs/read_write.c:1116 [inline] __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fd1644a65a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd162a19168 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007fd1645c6f80 RCX: 00007fd1644a65a9 RDX: 0000000000000188 RSI: 00000000200017c0 RDI: 0000000000000008 RBP: 00007fd1645017b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff221264cf R14: 00007fd162a19300 R15: 0000000000022000