INFO: task syz-executor.2:8789 can't die for more than 143 seconds. syz-executor.2 D27840 8789 7369 0x80004004 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] udf_tread+0xf9/0x1d0 fs/udf/misc.c:44 udf_check_vsd fs/udf/super.c:732 [inline] udf_load_vrs+0x2d0/0x9d0 fs/udf/super.c:1972 udf_fill_super+0x7c1/0x1723 fs/udf/super.c:2183 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:00007f9330e62c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6020 RCX: 000000000045c829 RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 0000000020000000 RBP: 000000000078bf00 R08: 0000000020000140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca1aa R15: 00007f9330e636d4 INFO: task syz-executor.2:8789 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.2 D27840 8789 7369 0x80004004 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] udf_tread+0xf9/0x1d0 fs/udf/misc.c:44 udf_check_vsd fs/udf/super.c:732 [inline] udf_load_vrs+0x2d0/0x9d0 fs/udf/super.c:1972 udf_fill_super+0x7c1/0x1723 fs/udf/super.c:2183 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:00007f9330e62c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6020 RCX: 000000000045c829 RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 0000000020000000 RBP: 000000000078bf00 R08: 0000000020000140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca1aa R15: 00007f9330e636d4 Showing all locks held in the system: 1 lock held by khungtaskd/1159: #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by syz-executor.2/8789: #0: ffff88805173e0e0 (&type->s_umount_key#49/1){+.+.}-{3:3}, at: alloc_super+0x1b3/0x9d0 fs/super.c:229 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1159 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: 2876 Comm: kworker/1:10 Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:754 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:776 [inline] RIP: 0010:lock_is_held_type+0x8b/0x350 kernel/locking/lockdep.c:4967 Code: c4 94 89 48 b9 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 08 00 0f 85 c3 02 00 00 48 83 3d 04 1c 3c 08 00 0f 84 ff 01 00 00 9c <58> 0f 1f 44 00 00 48 b9 00 00 00 00 00 fc ff df 48 89 44 24 10 48 RSP: 0018:ffffc900094d7a78 EFLAGS: 00000286 RAX: 1ffffffff132989b RBX: ffff88809ed56540 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88809ed56e0c RBP: 00000000000000e0 R08: ffff88809ed56540 R09: ffffed1015ce710c R10: ffff8880ae73885b R11: ffffed1015ce710b R12: 0000000000000140 R13: 0000000000000a20 R14: ffff888099dec400 R15: ffffffff899bef00 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb837365010 CR3: 0000000093aa6000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __alloc_skb+0xba/0x5a0 net/core/skbuff.c:198 kfree_skbmem net/core/skbuff.c:622 [inline] kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:616