Re: [syzbot] INFO: task can't die in show_free_areas

From: syzbot
Date: Wed Feb 02 2022 - 19:14:30 EST

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syzbot has found a reproducer for the following issue on:

HEAD commit: 6abab1b81b65 Add linux-next specific files for 20220202
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10de0ec8700000
kernel config: https://syzkaller.appspot.com/x/.config?x=b8d8750556896349
dashboard link: https://syzkaller.appspot.com/bug?extid=8f41dccfb6c03cc36fd6
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=133f0c58700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1205d17c700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8f41dccfb6c03cc36fd6@xxxxxxxxxxxxxxxxxxxxxxxxx

INFO: task syz-executor372:3664 can't die for more than 143 seconds.
task:syz-executor372 state:R running task stack:26120 pid: 3664 ppid: 3651 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5000 [inline]
__schedule+0xab2/0x4db0 kernel/sched/core.c:6309
preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6475
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
vprintk_emit+0x1c9/0x4f0 kernel/printk/printk.c:2249
vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
_printk+0xba/0xed kernel/printk/printk.c:2269
show_free_areas.cold+0x4aa/0x961 mm/page_alloc.c:6052
show_mem+0x31/0x191 lib/show_mem.c:17
warn_alloc_show_mem mm/page_alloc.c:4268 [inline]
warn_alloc.cold+0x121/0x189 mm/page_alloc.c:4293
__vmalloc_area_node mm/vmalloc.c:3003 [inline]
__vmalloc_node_range+0xeb5/0x1130 mm/vmalloc.c:3157
__vmalloc_node mm/vmalloc.c:3222 [inline]
vzalloc+0x67/0x80 mm/vmalloc.c:3292
n_tty_open+0x16/0x170 drivers/tty/n_tty.c:1813
tty_ldisc_open+0x9b/0x110 drivers/tty/tty_ldisc.c:433
tty_ldisc_setup+0x43/0x100 drivers/tty/tty_ldisc.c:740
tty_init_dev.part.0+0x1f4/0x610 drivers/tty/tty_io.c:1443
tty_init_dev include/linux/err.h:36 [inline]
tty_open_by_driver drivers/tty/tty_io.c:2086 [inline]
tty_open+0xb16/0x1000 drivers/tty/tty_io.c:2133
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x1240 fs/open.c:957
do_open fs/namei.c:3476 [inline]
path_openat+0x1c9e/0x2940 fs/namei.c:3609
do_filp_open+0x1aa/0x400 fs/namei.c:3636
do_sys_openat2+0x16d/0x4d0 fs/open.c:1347
do_sys_open fs/open.c:1363 [inline]
__do_sys_openat fs/open.c:1379 [inline]
__se_sys_openat fs/open.c:1374 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1374
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+0x44/0xae
RIP: 0033:0x7f5f16eac9d7
RSP: 002b:00007ffe798c0ac0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5f16eac9d7
RDX: 0000000000000002 RSI: 00007ffe798c0b50 RDI: 00000000ffffff9c
RBP: 00007ffe798c0b50 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe798c0c10 R14: 00007ffe798c0c50 R15: 0000000000000000
</TASK>
INFO: task syz-executor372:3665 can't die for more than 143 seconds.
task:syz-executor372 state:D stack:28112 pid: 3665 ppid: 3654 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5000 [inline]
__schedule+0xab2/0x4db0 kernel/sched/core.c:6309
schedule+0xd2/0x260 kernel/sched/core.c:6382
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6441
__mutex_lock_common kernel/locking/mutex.c:673 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733
tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x1240 fs/open.c:957
do_open fs/namei.c:3476 [inline]
path_openat+0x1c9e/0x2940 fs/namei.c:3609
do_filp_open+0x1aa/0x400 fs/namei.c:3636
do_sys_openat2+0x16d/0x4d0 fs/open.c:1347
do_sys_open fs/open.c:1363 [inline]
__do_sys_openat fs/open.c:1379 [inline]
__se_sys_openat fs/open.c:1374 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1374
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+0x44/0xae
RIP: 0033:0x7f5f16eac9d7
RSP: 002b:00007ffe798c0ac0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5f16eac9d7
RDX: 0000000000000002 RSI: 00007ffe798c0b50 RDI: 00000000ffffff9c
RBP: 00007ffe798c0b50 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe798c0c10 R14: 00007ffe798c0c50 R15: 0000000000000000
</TASK>
INFO: task syz-executor372:3665 blocked for more than 144 seconds.
Not tainted 5.17.0-rc2-next-20220202-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor372 state:D stack:28112 pid: 3665 ppid: 3654 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5000 [inline]
__schedule+0xab2/0x4db0 kernel/sched/core.c:6309
schedule+0xd2/0x260 kernel/sched/core.c:6382
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6441
__mutex_lock_common kernel/locking/mutex.c:673 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733
tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x1240 fs/open.c:957
do_open fs/namei.c:3476 [inline]
path_openat+0x1c9e/0x2940 fs/namei.c:3609
do_filp_open+0x1aa/0x400 fs/namei.c:3636
do_sys_openat2+0x16d/0x4d0 fs/open.c:1347
do_sys_open fs/open.c:1363 [inline]
__do_sys_openat fs/open.c:1379 [inline]
__se_sys_openat fs/open.c:1374 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1374
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+0x44/0xae
RIP: 0033:0x7f5f16eac9d7
RSP: 002b:00007ffe798c0ac0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5f16eac9d7
RDX: 0000000000000002 RSI: 00007ffe798c0b50 RDI: 00000000ffffff9c
RBP: 00007ffe798c0b50 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe798c0c10 R14: 00007ffe798c0c50 R15: 0000000000000000
</TASK>
INFO: task syz-executor372:3666 can't die for more than 144 seconds.
task:syz-executor372 state:D stack:27696 pid: 3666 ppid: 3653 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5000 [inline]
__schedule+0xab2/0x4db0 kernel/sched/core.c:6309
schedule+0xd2/0x260 kernel/sched/core.c:6382
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6441
__mutex_lock_common kernel/locking/mutex.c:673 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733
tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x1240 fs/open.c:957
do_open fs/namei.c:3476 [inline]
path_openat+0x1c9e/0x2940 fs/namei.c:3609
do_filp_open+0x1aa/0x400 fs/namei.c:3636
do_sys_openat2+0x16d/0x4d0 fs/open.c:1347
do_sys_open fs/open.c:1363 [inline]
__do_sys_openat fs/open.c:1379 [inline]
__se_sys_openat fs/open.c:1374 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1374
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+0x44/0xae
RIP: 0033:0x7f5f16eac9d7
RSP: 002b:00007ffe798c0ac0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5f16eac9d7
RDX: 0000000000000002 RSI: 00007ffe798c0b50 RDI: 00000000ffffff9c
RBP: 00007ffe798c0b50 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe798c0c10 R14: 00007ffe798c0c50 R15: 0000000000000000
</TASK>
INFO: task syz-executor372:3666 blocked for more than 144 seconds.
Not tainted 5.17.0-rc2-next-20220202-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor372 state:D stack:27696 pid: 3666 ppid: 3653 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5000 [inline]
__schedule+0xab2/0x4db0 kernel/sched/core.c:6309
schedule+0xd2/0x260 kernel/sched/core.c:6382
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6441
__mutex_lock_common kernel/locking/mutex.c:673 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733
tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x1240 fs/open.c:957
do_open fs/namei.c:3476 [inline]
path_openat+0x1c9e/0x2940 fs/namei.c:3609
do_filp_open+0x1aa/0x400 fs/namei.c:3636
do_sys_openat2+0x16d/0x4d0 fs/open.c:1347
do_sys_open fs/open.c:1363 [inline]
__do_sys_openat fs/open.c:1379 [inline]
__se_sys_openat fs/open.c:1374 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1374
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+0x44/0xae
RIP: 0033:0x7f5f16eac9d7
RSP: 002b:00007ffe798c0ac0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5f16eac9d7
RDX: 0000000000000002 RSI: 00007ffe798c0b50 RDI: 00000000ffffff9c
RBP: 00007ffe798c0b50 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe798c0c10 R14: 00007ffe798c0c50 R15: 0000000000000000
</TASK>
INFO: task syz-executor372:3671 can't die for more than 144 seconds.
task:syz-executor372 state:D stack:28112 pid: 3671 ppid: 3652 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5000 [inline]
__schedule+0xab2/0x4db0 kernel/sched/core.c:6309
schedule+0xd2/0x260 kernel/sched/core.c:6382
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6441
__mutex_lock_common kernel/locking/mutex.c:673 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733
tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x1240 fs/open.c:957
do_open fs/namei.c:3476 [inline]
path_openat+0x1c9e/0x2940 fs/namei.c:3609
do_filp_open+0x1aa/0x400 fs/namei.c:3636
do_sys_openat2+0x16d/0x4d0 fs/open.c:1347
do_sys_open fs/open.c:1363 [inline]
__do_sys_openat fs/open.c:1379 [inline]
__se_sys_openat fs/open.c:1374 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1374
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+0x44/0xae
RIP: 0033:0x7f5f16eac9d7
RSP: 002b:00007ffe798c0ac0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5f16eac9d7
RDX: 0000000000000002 RSI: 00007ffe798c0b50 RDI: 00000000ffffff9c
RBP: 00007ffe798c0b50 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe798c0c10 R14: 00007ffe798c0c50 R15: 0000000000000001
</TASK>
INFO: task syz-executor372:3671 blocked for more than 145 seconds.
Not tainted 5.17.0-rc2-next-20220202-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor372 state:D stack:28112 pid: 3671 ppid: 3652 flags:0x00000004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5000 [inline]
__schedule+0xab2/0x4db0 kernel/sched/core.c:6309
schedule+0xd2/0x260 kernel/sched/core.c:6382
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6441
__mutex_lock_common kernel/locking/mutex.c:673 [inline]
__mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:733
tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4b9/0x1240 fs/open.c:957
do_open fs/namei.c:3476 [inline]
path_openat+0x1c9e/0x2940 fs/namei.c:3609
do_filp_open+0x1aa/0x400 fs/namei.c:3636
do_sys_openat2+0x16d/0x4d0 fs/open.c:1347
do_sys_open fs/open.c:1363 [inline]
__do_sys_openat fs/open.c:1379 [inline]
__se_sys_openat fs/open.c:1374 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1374
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+0x44/0xae
RIP: 0033:0x7f5f16eac9d7
RSP: 002b:00007ffe798c0ac0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5f16eac9d7
RDX: 0000000000000002 RSI: 00007ffe798c0b50 RDI: 00000000ffffff9c
RBP: 00007ffe798c0b50 R08: 0000000000000000 R09: 000000000000000e
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007ffe798c0c10 R14: 00007ffe798c0c50 R15: 0000000000000001
</TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8bb83a60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6463
2 locks held by getty/3274:
#0: ffff88814abb0098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
#1: ffffc90002b562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2077
3 locks held by syz-executor372/3664:
1 lock held by syz-executor372/3665:
#0: ffffffff8c5b60c8 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
#0: ffffffff8c5b60c8 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133
1 lock held by syz-executor372/3666:
#0: ffffffff8c5b60c8 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
#0: ffffffff8c5b60c8 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133
1 lock held by syz-executor372/3671:
#0: ffffffff8c5b60c8 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
#0: ffffffff8c5b60c8 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133
1 lock held by syz-executor372/3680:
#0: ffffffff8c5b60c8 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
#0: ffffffff8c5b60c8 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133
1 lock held by syz-executor372/3683:
#0: ffffffff8c5b60c8 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2050 [inline]
#0: ffffffff8c5b60c8 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x55e/0x1000 drivers/tty/tty_io.c:2133

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.17.0-rc2-next-20220202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<TASK>
__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:256 [inline]
watchdog+0xcb7/0xed0 kernel/hung_task.c:413
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3668 Comm: kworker/u4:6 Not tainted 5.17.0-rc2-next-20220202-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:__lock_release kernel/locking/lockdep.c:5323 [inline]
RIP: 0010:lock_release+0x217/0x720 kernel/locking/lockdep.c:5659
Code: e8 6e 08 ff ff 48 85 c0 48 89 c3 0f 84 85 03 00 00 48 8d 78 24 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 94 04 00 00 8b
RSP: 0018:ffffc900028bf920 EFLAGS: 00000807
RAX: dffffc0000000000 RBX: ffff88801f760b30 RCX: ffffc900028bf970
RDX: 0000000000000000 RSI: ffff888010db6138 RDI: ffff88801f760b54
RBP: 1ffff92000517f26 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 000000000000003f R12: ffff888010db6138
R13: 0000000000000006 R14: ffff88801f760a60 R15: ffff88801f760000
FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80cab3f680 CR3: 000000000b88e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x12/0x40 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:394 [inline]
__text_poke+0x5d4/0x8c0 arch/x86/kernel/alternative.c:1059
text_poke_bp_batch+0x2c3/0x4e0 arch/x86/kernel/alternative.c:1313
text_poke_flush arch/x86/kernel/alternative.c:1470 [inline]
text_poke_flush arch/x86/kernel/alternative.c:1467 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1477
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
jump_label_update+0x1da/0x400 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:748 [inline]
toggle_allocation_gate+0x183/0x390 mm/kfence/core.c:726
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:377
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.308 msecs
----------------
Code disassembly (best guess):
0: e8 6e 08 ff ff callq 0xffff0873
5: 48 85 c0 test %rax,%rax
8: 48 89 c3 mov %rax,%rbx
b: 0f 84 85 03 00 00 je 0x396
11: 48 8d 78 24 lea 0x24(%rax),%rdi
15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1c: fc ff df
1f: 48 89 fa mov %rdi,%rdx
22: 48 c1 ea 03 shr $0x3,%rdx
26: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx
* 2a: 48 89 f8 mov %rdi,%rax <-- trapping instruction
2d: 83 e0 07 and $0x7,%eax
30: 83 c0 03 add $0x3,%eax
33: 38 d0 cmp %dl,%al
35: 7c 08 jl 0x3f
37: 84 d2 test %dl,%dl
39: 0f 85 94 04 00 00 jne 0x4d3
3f: 8b .byte 0x8b

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