INFO: task syz-executor.1:8748 can't die for more than 143 seconds. syz-executor.1 D26824 8748 7244 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] readSuper+0xa6/0x250 fs/jfs/jfs_mount.c:454 chkSuper+0xa3/0xcd0 fs/jfs/jfs_mount.c:300 jfs_mount+0x47/0x3d0 fs/jfs/jfs_mount.c:81 jfs_fill_super+0x5ba/0xbc0 fs/jfs/super.c:562 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: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007f6224b38c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29 RDX: 0000000020000240 RSI: 0000000020000200 RDI: 00000000200001c0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007f6224b396d4 INFO: task syz-executor.1:8748 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.1 D26824 8748 7244 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] readSuper+0xa6/0x250 fs/jfs/jfs_mount.c:454 chkSuper+0xa3/0xcd0 fs/jfs/jfs_mount.c:300 jfs_mount+0x47/0x3d0 fs/jfs/jfs_mount.c:81 jfs_fill_super+0x5ba/0xbc0 fs/jfs/super.c:562 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: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007f6224b38c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29 RDX: 0000000020000240 RSI: 0000000020000200 RDI: 00000000200001c0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007f6224b396d4 INFO: task syz-executor.1:8778 can't die for more than 143 seconds. syz-executor.1 D28984 8778 7244 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: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007f6224af6c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29 RDX: 0000000020000240 RSI: 0000000020000200 RDI: 00000000200001c0 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007f6224af76d4 INFO: task syz-executor.1:8778 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.1 D28984 8778 7244 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: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007f6224af6c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29 RDX: 0000000020000240 RSI: 0000000020000200 RDI: 00000000200001c0 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007f6224af76d4 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 1 lock held by syz-executor.1/8748: #0: ffff888094fe20e0 (&type->s_umount_key#54/1){+.+.}-{3:3}, at: alloc_super+0x1b3/0x9d0 fs/super.c:229 2 locks held by syz-executor.1/8778: #0: ffff88808a9573d0 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: mount_bdev+0x90/0x3c0 fs/super.c:1384 #1: ffff888094fe20e0 (&type->s_umount_key#55){+.+.}-{3:3}, at: grab_super+0xa3/0x260 fs/super.c:389 ============================================= NMI backtrace for cpu 0 CPU: 0 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4129 Comm: systemd-journal 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: 0033:0x7f16346a4278 Code: 4c 89 5a 10 48 89 1a 0f 87 7b ff ff ff 48 89 f8 48 f7 d0 48 01 c8 48 83 e0 f8 48 8d 7c 07 08 48 8d 0d ec 40 06 00 48 63 04 b1 <48> 01 c8 ff e0 0f 1f 00 48 8d 0d d9 46 06 00 48 8d 35 65 2a 04 00 RSP: 002b:00007ffdb1253140 EFLAGS: 00000246 RAX: fffffffffff9bdb1 RBX: b57142791ec0b891 RCX: 00007f1634708360 RDX: 00007ffdb1253170 RSI: 0000000000000000 RDI: 00007ffdb1253160 RBP: 0000000000000011 R08: 00007ffdb1253160 R09: 0000000000000011 R10: 198089714b3ab346 R11: 70b55721a6ea5fbf R12: 0000000000000011 R13: 00007ffdb1253350 R14: 00007ffdb1253348 R15: 00007ffdb1253350 FS: 00007f16349dc8c0 GS: 0000000000000000