audit: type=1804 audit(1672466567.238:253): pid=3511 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.4" name="/root/syzkaller-testdir1500318840/syzkaller.5SJfFf/0/bus" dev="sda1" ino=13880 res=1 Bluetooth: hci10: command 0x041b tx timeout Bluetooth: hci10: command 0x040f tx timeout Bluetooth: hci10: command 0x0419 tx timeout INFO: task syz-executor.4:2804 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. syz-executor.4 D28592 2804 29087 0x00000004 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_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 iterate_supers+0xdb/0x290 fs/super.c:631 ksys_sync+0x86/0x150 fs/sync.c:113 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f5f00a340a9 Code: Bad RIP value. RSP: 002b:00007f5efefa6168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f5f00b53f80 RCX: 00007f5f00a340a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f5f00a8fae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc41b6b19f R14: 00007f5efefa6300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1569: #0: 00000000842e438c (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7800: #0: 00000000519081de (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.4/28348: #0: 00000000b67b392b (&type->s_umount_key#61/1){+.+.}, at: alloc_super fs/super.c:226 [inline] #0: 00000000b67b392b (&type->s_umount_key#61/1){+.+.}, at: sget_userns+0x20b/0xcd0 fs/super.c:519 1 lock held by syz-executor.4/28724: #0: 0000000068c881c2 (&type->s_umount_key#61/1){+.+.}, at: alloc_super fs/super.c:226 [inline] #0: 0000000068c881c2 (&type->s_umount_key#61/1){+.+.}, at: sget_userns+0x20b/0xcd0 fs/super.c:519 1 lock held by syz-executor.4/29033: #0: 00000000942d4e8f (&type->s_umount_key#61/1){+.+.}, at: alloc_super fs/super.c:226 [inline] #0: 00000000942d4e8f (&type->s_umount_key#61/1){+.+.}, at: sget_userns+0x20b/0xcd0 fs/super.c:519 1 lock held by syz-executor.4/2804: #0: 00000000b67b392b (&type->s_umount_key#62){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.4/3179: #0: 00000000b67b392b (&type->s_umount_key#62){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.4/3181: #0: 00000000b67b392b (&type->s_umount_key#62){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.4/3513: #0: 00000000b67b392b (&type->s_umount_key#62){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.4/3514: #0: 00000000b67b392b (&type->s_umount_key#62){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1569 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4694 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:__sanitizer_cov_trace_pc+0x22/0x50 kernel/kcov.c:101 Code: 90 90 90 90 90 90 90 90 48 8b 34 24 65 48 8b 04 25 c0 df 01 00 65 8b 15 cc 59 9f 7e 81 e2 00 01 1f 00 75 2b 8b 90 60 13 00 00 <83> fa 02 75 20 48 8b 88 68 13 00 00 8b 80 64 13 00 00 48 8b 11 48 RSP: 0018:ffff8880a0fcfc08 EFLAGS: 00000046 RAX: ffff8880a0fc0600 RBX: 0000000000000000 RCX: ffff8880a0fcfc78 RDX: 0000000000000000 RSI: ffffffff83f4ac59 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed101429fa60 R10: ffff8880a14fd303 R11: 0000000000000000 R12: ffff8880a0fcfdd8 R13: ffff8880a14fd390 R14: ffff8880a14fd300 R15: ffff8880a0c9cd98 FS: 00007f6bf527a8c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6bf136e018 CR3: 00000000a0c95000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __pm_relax+0x9/0x30 drivers/base/power/wakeup.c:694 ep_scan_ready_list+0x573/0x9a0 fs/eventpoll.c:738 ep_send_events fs/eventpoll.c:1711 [inline] ep_poll+0x36f/0xcb0 fs/eventpoll.c:1838 do_epoll_wait+0x1aa/0x200 fs/eventpoll.c:2190 __do_sys_epoll_wait fs/eventpoll.c:2200 [inline] __se_sys_epoll_wait fs/eventpoll.c:2197 [inline] __x64_sys_epoll_wait+0x93/0xf0 fs/eventpoll.c:2197 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f6bf45432e3 Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 29 54 2b 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24 RSP: 002b:00007ffc1d8c4168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 000055b5962c81e0 RCX: 00007f6bf45432e3 RDX: 0000000000000013 RSI: 00007ffc1d8c4170 RDI: 0000000000000008 RBP: 00007ffc1d8c4360 R08: 00007ffc1d9b1000 R09: 000002f3449a47e5 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc1d8c4170 R13: 0000000000000001 R14: ffffffffffffffff R15: 0005f119791cc13a