INFO: task syz-executor.0:4835 can't die for more than 143 seconds. syz-executor.0 R running task 29288 4835 7083 0x00004006 Call Trace: Showing all locks held in the system: 1 lock held by khungtaskd/1146: #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by in:imklog/6768: #0: ffff88809f741bb0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 2 locks held by syz-executor.0/4835: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1146 Comm: khungtaskd Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xde3/0x14e0 kernel/hung_task.c:333 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4835 Comm: syz-executor.0 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:check_memory_region+0x16/0x190 mm/kasan/generic.c:192 Code: 01 0f 1f 00 48 89 f2 be f8 00 00 00 e9 13 af ff 01 0f 1f 00 48 85 f6 0f 84 40 01 00 00 49 89 fa 41 54 0f b6 d2 49 01 f2 55 53 <0f> 82 20 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f 86 0d RSP: 0018:ffffc900189bf988 EFLAGS: 00000092 RAX: 0000000000000013 RBX: 00000000000004e9 RCX: ffffffff81594014 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8c313a78 RBP: ffff88820d14ad90 R08: 0000000000000001 R09: fffffbfff1862750 R10: ffffffff8c313a80 R11: fffffbfff186274f R12: ffff88820d14a4c0 R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8a8b8010 FS: 00007f0200c88700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc851339000 CR3: 000000020fa25000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:56 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] hlock_class kernel/locking/lockdep.c:179 [inline] lookup_chain_cache_add kernel/locking/lockdep.c:3146 [inline] validate_chain kernel/locking/lockdep.c:3202 [inline] __lock_acquire+0x2184/0x4c50 kernel/locking/lockdep.c:4355 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103 pipe_lock_nested fs/pipe.c:66 [inline] pipe_double_lock+0x171/0x1e0 fs/pipe.c:101 splice_pipe_to_pipe fs/splice.c:1562 [inline] do_splice+0x377/0x1560 fs/splice.c:1141 __do_sys_splice fs/splice.c:1447 [inline] __se_sys_splice fs/splice.c:1427 [inline] __x64_sys_splice+0x2c1/0x330 fs/splice.c:1427 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0200c87c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00000000005079c0 RCX: 000000000045ca29 RDX: 000000000000000a RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000078c220 R08: 000000000011008a R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000bae R14: 00000000004ce9f7 R15: 00007f0200c886d4