INFO: task syz-executor.3:26781 can't die for more than 143 seconds. syz-executor.3 D27856 26781 7353 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:00007f4658097c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29 RDX: 0000000020000280 RSI: 0000000020000200 RDI: 00000000200001c0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007f46580986d4 INFO: task syz-executor.3:26781 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.3 D27856 26781 7353 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:00007f4658097c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29 RDX: 0000000020000280 RSI: 0000000020000200 RDI: 00000000200001c0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007f46580986d4 INFO: task syz-executor.3:26823 can't die for more than 143 seconds. syz-executor.3 D28984 26823 7353 0x00004004 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:00007f4658055c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29 RDX: 0000000020000280 RSI: 0000000020000200 RDI: 00000000200001c0 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007f46580566d4 INFO: task syz-executor.3:26823 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.3 D28984 26823 7353 0x00004004 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:00007f4658055c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000004f6280 RCX: 000000000045ca29 RDX: 0000000020000280 RSI: 0000000020000200 RDI: 00000000200001c0 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000751 R14: 00000000004ca3aa R15: 00007f46580566d4 Showing all locks held in the system: 1 lock held by kworker/u4:3/141: #0: ffff8880ae7379d8 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x9be/0xdb0 kernel/sched/fair.c:10512 1 lock held by khungtaskd/1168: #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 3 locks held by in:imklog/6748: #0: ffff8880a2cb93b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 #1: ffff8880ae7379d8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1262 [inline] #1: ffff8880ae7379d8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x233/0x1ff0 kernel/sched/core.c:4034 #2: ffff8880ae722ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x304/0x410 kernel/sched/psi.c:817 2 locks held by agetty/6974: #0: ffff8880a2463098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc90000f902e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x220/0x1b30 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.3/26781: #0: ffff8880a222e0e0 (&type->s_umount_key#76/1){+.+.}-{3:3}, at: alloc_super+0x1b3/0x9d0 fs/super.c:229 2 locks held by syz-executor.3/26823: #0: ffff88808ae36890 (&bdev->bd_fsfreeze_mutex){+.+.}-{3:3}, at: mount_bdev+0x90/0x3c0 fs/super.c:1384 #1: ffff8880a222e0e0 (&type->s_umount_key#77){+.+.}-{3:3}, at: grab_super+0xa3/0x260 fs/super.c:389 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1168 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: 4136 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: 0010:__kernel_text_address+0x9/0x30 kernel/extable.c:105 Code: ef e8 2b b8 31 00 0f b6 c0 eb e0 48 c7 c7 04 13 8b 8a e8 4a 8d 64 00 e9 6d ff ff ff 0f 1f 44 00 00 53 48 89 fb e8 17 ff ff ff <85> c0 75 17 48 81 fb 00 00 93 8b 72 0c 31 c0 48 81 fb 36 ac a7 8b RSP: 0018:ffffc900052d7ab0 EFLAGS: 00000096 RAX: 0000000000000001 RBX: ffffffff814db83e RCX: 0000000000000000 RDX: 1ffff92000a5af64 RSI: ffffc900052d7998 RDI: ffffffff814db83e RBP: ffffc900052d7b20 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000028547 R11: 000000000007001f R12: ffffc900052d7b88 R13: 0000000000000000 R14: ffff888092c62240 R15: 0000000000000000 FS: 00007f4f9905b8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4f96563000 CR3: 000000009300e000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: unwind_get_return_address arch/x86/kernel/unwind_orc.c:314 [inline] unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:309 arch_stack_walk+0x84/0xd0 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123 save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:456 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x7f/0x320 mm/slab.c:3694 __put_cred+0x1de/0x250 kernel/cred.c:148 put_cred include/linux/cred.h:287 [inline] do_faccessat+0x64d/0x7a0 fs/open.c:439 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7f4f983179c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fff760b06e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007fff760b3710 RCX: 00007f4f983179c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055d38adfb9a3 RBP: 00007fff760b0830 R08: 000055d38adf13e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 000055d38bf918a0 R15: 00007fff760b0d20