INFO: task syz-executor236:3869 blocked for more than 143 seconds.
Not tainted 5.19.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor236 state:D stack:27344 pid: 3869 ppid: 3611 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5116 [inline]
__schedule+0xa00/0x4b30 kernel/sched/core.c:6428
schedule+0xd2/0x1f0 kernel/sched/core.c:6500
schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911
do_wait_for_common kernel/sched/completion.c:85 [inline]
__wait_for_common+0x378/0x530 kernel/sched/completion.c:106
kthread_stop+0x17a/0x720 kernel/kthread.c:708
ext4_stop_mmpd+0x47/0xd0 fs/ext4/mmp.c:255
__ext4_fill_super fs/ext4/super.c:5450 [inline]
ext4_fill_super+0x9dd6/0xe860 fs/ext4/super.c:5499
get_tree_bdev+0x440/0x760 fs/super.c:1292
vfs_get_tree+0x89/0x2f0 fs/super.c:1497
do_new_mount fs/namespace.c:3040 [inline]
path_mount+0x1320/0x1fa0 fs/namespace.c:3370
do_mount fs/namespace.c:3383 [inline]
__do_sys_mount fs/namespace.c:3591 [inline]
__se_sys_mount fs/namespace.c:3568 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f62add9bd7a
RSP: 002b:00007ffe812c0658 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe812c06b0 RCX: 00007f62add9bd7a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe812c0670
RBP: 00007ffe812c0670 R08: 00007ffe812c06b0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000308
R13: 0000000000000003 R14: 0000000000000004 R15: 000000000000000b
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8bd83ce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6491
2 locks held by getty/3295:
#0: ffff888021fed098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
#1: ffffc90001c382e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xe50/0x13c0 drivers/tty/n_tty.c:2124
1 lock held by syz-executor236/3869:
#0: ffff8880734920e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x1dd/0xa80 fs/super.c:228
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 5.19.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xc22/0xf90 kernel/hung_task.c:378
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1297 Comm: kworker/u4:6 Not tainted 5.19.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1c/0x60 kernel/kcov.c:200
Code: be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 59 cc 88 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 80 6f 02 00 00 01 ff 00 74 0e 85 c9 74 35 8b 82 a4 15 00 00 85 c0 74 2b 8b
RSP: 0018:ffffc900050978d8 EFLAGS: 00000246
RAX: 0000000080000000 RBX: ffffc90005097a50 RCX: 0000000000000000
RDX: ffff88802123e240 RSI: ffffffff8423cfa4 RDI: 0000000000000001
RBP: 00000000000000e9 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: 00000000000000e9 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055aa40fb59c8 CR3: 000000000ba8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
insn_is_avx arch/x86/include/asm/insn.h:168 [inline]
insn_get_opcode.part.0+0x154/0x990 arch/x86/lib/insn.c:283
insn_get_opcode arch/x86/lib/insn.c:271 [inline]
insn_get_modrm+0x355/0x7c0 arch/x86/lib/insn.c:343
insn_get_sib+0x29c/0x330 arch/x86/lib/insn.c:421
insn_get_displacement+0x346/0x6c0 arch/x86/lib/insn.c:464
insn_get_immediate arch/x86/lib/insn.c:632 [inline]
insn_get_length arch/x86/lib/insn.c:707 [inline]
insn_decode+0x35b/0x3b0 arch/x86/lib/insn.c:747
arch_jump_entry_size+0xa0/0x110 arch/x86/kernel/jump_label.c:24
__jump_label_patch+0x80/0x330 arch/x86/kernel/jump_label.c:45
arch_jump_label_transform_queue+0x63/0x100 arch/x86/kernel/jump_label.c:137
__jump_label_update+0x12e/0x400 kernel/jump_label.c:451
jump_label_update+0x32f/0x410 kernel/jump_label.c:830
static_key_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207
static_key_disable+0x16/0x20 kernel/jump_label.c:215
toggle_allocation_gate mm/kfence/core.c:822 [inline]
toggle_allocation_gate+0x183/0x390 mm/kfence/core.c:800
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.062 msecs
----------------
Code disassembly (best guess):
0: be a8 01 00 00 mov $0x1a8,%esi
5: e8 b4 ff ff ff callq 0xffffffbe
a: 31 c0 xor %eax,%eax
c: c3 retq
d: 90 nop
e: 65 8b 05 59 cc 88 7e mov %gs:0x7e88cc59(%rip),%eax # 0x7e88cc6e
15: 89 c1 mov %eax,%ecx
17: 48 8b 34 24 mov (%rsp),%rsi
1b: 81 e1 00 01 00 00 and $0x100,%ecx
21: 65 48 8b 14 25 80 6f mov %gs:0x26f80,%rdx
28: 02 00
* 2a: a9 00 01 ff 00 test $0xff0100,%eax <-- trapping instruction
2f: 74 0e je 0x3f
31: 85 c9 test %ecx,%ecx
33: 74 35 je 0x6a
35: 8b 82 a4 15 00 00 mov 0x15a4(%rdx),%eax
3b: 85 c0 test %eax,%eax
3d: 74 2b je 0x6a
3f: 8b .byte 0x8b