INFO: task syz-executor.4:28892 can't die for more than 143 seconds. syz-executor.4 D28272 28892 7561 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 io_schedule+0x17/0x60 kernel/sched/core.c:5806 bit_wait_io+0x12/0x90 kernel/sched/wait_bit.c:209 __wait_on_bit+0x5e/0x190 kernel/sched/wait_bit.c:49 out_of_line_wait_on_bit+0xd5/0x110 kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer fs/buffer.c:122 [inline] wait_on_buffer include/linux/buffer_head.h:354 [inline] __bread_slow fs/buffer.c:1249 [inline] __bread_gfp+0x2b2/0x370 fs/buffer.c:1430 sb_bread include/linux/buffer_head.h:307 [inline] read_raw_super_block fs/f2fs/super.c:3067 [inline] f2fs_fill_super+0x2e4/0x74b0 fs/f2fs/super.c:3336 mount_bdev+0x305/0x3c0 fs/super.c:1417 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2813 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3138 __do_sys_mount fs/namespace.c:3347 [inline] __se_sys_mount fs/namespace.c:3324 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3324 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007f13423ccc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6020 RCX: 000000000045c829 RDX: 0000000020000080 RSI: 0000000020000200 RDI: 0000000020000140 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca1aa R15: 00007f13423cd6d4 INFO: task syz-executor.4:28892 blocked for more than 143 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28272 28892 7561 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 io_schedule+0x17/0x60 kernel/sched/core.c:5806 bit_wait_io+0x12/0x90 kernel/sched/wait_bit.c:209 __wait_on_bit+0x5e/0x190 kernel/sched/wait_bit.c:49 out_of_line_wait_on_bit+0xd5/0x110 kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer fs/buffer.c:122 [inline] wait_on_buffer include/linux/buffer_head.h:354 [inline] __bread_slow fs/buffer.c:1249 [inline] __bread_gfp+0x2b2/0x370 fs/buffer.c:1430 sb_bread include/linux/buffer_head.h:307 [inline] read_raw_super_block fs/f2fs/super.c:3067 [inline] f2fs_fill_super+0x2e4/0x74b0 fs/f2fs/super.c:3336 mount_bdev+0x305/0x3c0 fs/super.c:1417 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2813 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3138 __do_sys_mount fs/namespace.c:3347 [inline] __se_sys_mount fs/namespace.c:3324 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3324 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007f13423ccc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6020 RCX: 000000000045c829 RDX: 0000000020000080 RSI: 0000000020000200 RDI: 0000000020000140 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca1aa R15: 00007f13423cd6d4 INFO: task syz-executor.4:28893 can't die for more than 143 seconds. syz-executor.4 D28064 28893 28892 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 rwsem_down_write_slowpath+0x6eb/0xf80 kernel/locking/rwsem.c:1235 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1532 grab_super+0xa3/0x260 fs/super.c:389 sget+0x1c7/0x560 fs/super.c:605 mount_bdev+0xf8/0x3c0 fs/super.c:1390 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2813 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3138 __do_sys_mount fs/namespace.c:3347 [inline] __se_sys_mount fs/namespace.c:3324 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3324 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007f13423ccc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6020 RCX: 000000000045c829 RDX: 0000000020000080 RSI: 0000000020000200 RDI: 0000000020000140 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca1aa R15: 00007f13423cd6d4 INFO: task syz-executor.4:28893 blocked for more than 144 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28064 28893 28892 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 rwsem_down_write_slowpath+0x6eb/0xf80 kernel/locking/rwsem.c:1235 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1532 grab_super+0xa3/0x260 fs/super.c:389 sget+0x1c7/0x560 fs/super.c:605 mount_bdev+0xf8/0x3c0 fs/super.c:1390 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2813 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3138 __do_sys_mount fs/namespace.c:3347 [inline] __se_sys_mount fs/namespace.c:3324 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3324 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007f13423ccc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6020 RCX: 000000000045c829 RDX: 0000000020000080 RSI: 0000000020000200 RDI: 0000000020000140 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca1aa R15: 00007f13423cd6d4 Showing all locks held in the system: 1 lock held by khungtaskd/1167: #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 2 locks held by in:imklog/7099: #0: ffff8880972551b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 #1: ffffffff899b3d18 (logbuf_lock){-.-.}-{2:2}, at: is_bpf_text_address+0x0/0x160 kernel/bpf/core.c:691 2 locks held by kworker/u4:23/11051: #0: ffff8880ae6379d8 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x9be/0xdb0 kernel/sched/fair.c:10512 #1: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x42/0x3e0 kernel/sched/fair.c:5969 1 lock held by syz-executor.4/28892: #0: ffff88805fab00e0 (&type->s_umount_key#54/1){+.+.}-{3:3}, at: alloc_super+0x1b3/0x9d0 fs/super.c:229 2 locks held by syz-executor.4/28893: #0: ffff88808a646350 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: mount_bdev+0x90/0x3c0 fs/super.c:1384 #1: ffff88805fab00e0 (&type->s_umount_key#92){+.+.}-{3:3}, at: grab_super+0xa3/0x260 fs/super.c:389 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1167 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 10 Comm: rcu_preempt 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:__write_once_size include/linux/compiler.h:250 [inline] RIP: 0010:hlist_add_head include/linux/list.h:880 [inline] RIP: 0010:enqueue_timer+0x8d/0x440 kernel/time/timer.c:540 Code: 74 28 e8 c6 21 10 00 49 8d 7e 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 8c 03 00 00 49 89 5e 08 9e 21 10 00 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 RSP: 0018:ffffc90000d0fc78 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffc90000d0fd08 RCX: ffffffff8162a852 RDX: 1ffff11014ba6483 RSI: ffffffff816312ca RDI: ffff8880a5d32418 RBP: 0000000000000003 R08: ffff8880a95e6280 R09: fffffbfff1925fea R10: ffffffff8c92ff4b R11: fffffbfff1925fe9 R12: ffff8880ae627638 R13: ffff8880ae627580 R14: ffff8880a5d32410 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff510925000 CR3: 00000000a2d22000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: internal_add_timer kernel/time/timer.c:595 [inline] __mod_timer kernel/time/timer.c:1054 [inline] schedule_timeout+0x32e/0x850 kernel/time/timer.c:1897 rcu_gp_fqs_loop kernel/rcu/tree.c:1674 [inline] rcu_gp_kthread+0x9bf/0x1960 kernel/rcu/tree.c:1836 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352