------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.138/6342 is trying to acquire lock:
ffffffff8e6f53c0 (console_owner){....}-{0:0}, at: console_lock_spinning_enable+0x61/0x80 kernel/printk/printk.c:1902
but task is already holding lock:
ffff8880b843b2e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:655 [inline]
ffff8880b843b2e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:639
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #5 (&rq->__lock){-.-.}-{2:2}:
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2c/0x140 kernel/sched/core.c:647
raw_spin_rq_lock kernel/sched/sched.h:1615 [inline]
_task_rq_lock+0xcf/0x490 kernel/sched/core.c:747
cgroup_move_task+0x81/0x2b0 kernel/sched/psi.c:1170
css_set_move_task+0x285/0x600 kernel/cgroup/cgroup.c:948
cgroup_post_fork+0x202/0x9b0 kernel/cgroup/cgroup.c:6911
copy_process+0x5f26/0x7a10 kernel/fork.c:2467
kernel_clone+0xfc/0x9a0 kernel/fork.c:2654
user_mode_thread+0xcc/0x110 kernel/fork.c:2730
rest_init+0x21/0x260 init/main.c:725
start_kernel+0x47f/0x480 init/main.c:1210
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148
-> #4 (&p->pi_lock){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:570 [inline]
try_to_wake_up+0xb2/0x1a80 kernel/sched/core.c:4130
create_worker+0x33a/0x740 kernel/workqueue.c:2847
workqueue_init+0x768/0x930 kernel/workqueue.c:8042
kernel_init_freeable+0x3d4/0x7a0 init/main.c:1677
kernel_init+0x1f/0x1e0 init/main.c:1582
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #3 (&pool->lock){-.-.}-{2:2}:
__raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
__queue_work+0x270/0x1150 kernel/workqueue.c:2314
queue_work_on+0x1a9/0x1e0 kernel/workqueue.c:2405
queue_work include/linux/workqueue.h:669 [inline]
rpm_suspend+0xee1/0x11c0 drivers/base/power/runtime.c:688
rpm_idle+0x637/0x7c0 drivers/base/power/runtime.c:562
__pm_runtime_idle+0xba/0x1a0 drivers/base/power/runtime.c:1129
pm_runtime_put include/linux/pm_runtime.h:551 [inline]
__device_attach+0x37e/0x4d0 drivers/base/dd.c:1051
device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1088
bus_probe_device+0x64/0x160 drivers/base/bus.c:574
device_add+0x11d9/0x1950 drivers/base/core.c:3689
serial_base_port_add+0x227/0x2b0 drivers/tty/serial/serial_base_bus.c:186
serial_core_port_device_add drivers/tty/serial/serial_core.c:3257 [inline]
serial_core_register_port+0x13c/0x17a0 drivers/tty/serial/serial_core.c:3296
serial8250_register_8250_port+0x155a/0x2260 drivers/tty/serial/8250/8250_core.c:822
serial_pnp_probe+0x436/0x930 drivers/tty/serial/8250/8250_pnp.c:480
pnp_device_probe+0x2b3/0x4a0 drivers/pnp/driver.c:111
call_driver_probe drivers/base/dd.c:583 [inline]
really_probe+0x241/0xa60 drivers/base/dd.c:661
__driver_probe_device+0x1de/0x400 drivers/base/dd.c:803
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:833
__driver_attach+0x2f4/0x6a0 drivers/base/dd.c:1227
bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383
bus_add_driver+0x305/0x5b0 drivers/base/bus.c:715
driver_register+0x1e2/0x360 drivers/base/driver.c:249
serial8250_init+0xcc/0x1b0 drivers/tty/serial/8250/8250_platform.c:317
do_one_initcall+0x11d/0x760 init/main.c:1382
do_initcall_level init/main.c:1444 [inline]
do_initcalls init/main.c:1460 [inline]
do_basic_setup init/main.c:1479 [inline]
kernel_init_freeable+0x6e5/0x7a0 init/main.c:1692
kernel_init+0x1f/0x1e0 init/main.c:1582
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #2 (&dev->power.lock){-.-.}-{3:3}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
__pm_runtime_resume+0xa9/0x170 drivers/base/power/runtime.c:1196
pm_runtime_get include/linux/pm_runtime.h:494 [inline]
__uart_start+0x1b0/0x510 drivers/tty/serial/serial_core.c:149
uart_write+0x211/0xb20 drivers/tty/serial/serial_core.c:633
process_output_block drivers/tty/n_tty.c:557 [inline]
n_tty_write+0x44f/0x12d0 drivers/tty/n_tty.c:2366
iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
file_tty_write.isra.0+0x4d2/0x890 drivers/tty/tty_io.c:1081
tty_write drivers/tty/tty_io.c:1102 [inline]
redirected_tty_write drivers/tty/tty_io.c:1125 [inline]
redirected_tty_write+0xd4/0x120 drivers/tty/tty_io.c:1105
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x6ac/0x1070 fs/read_write.c:688
ksys_write+0x12a/0x250 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&port_lock_key){-.-.}-{3:3}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
uart_port_lock_irqsave include/linux/serial_core.h:717 [inline]
serial8250_console_write+0x17e/0x1900 drivers/tty/serial/8250/8250_port.c:3301
console_emit_next_record kernel/printk/printk.c:3183 [inline]
console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
_printk+0xcf/0x110 kernel/printk/printk.c:2504
register_console.cold+0xc0/0x248 kernel/printk/printk.c:4208
univ8250_console_init+0x6f/0x80 drivers/tty/serial/8250/8250_core.c:515
console_init+0x423/0x620 kernel/printk/printk.c:4407
start_kernel+0x305/0x480 init/main.c:1147
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148
-> #0 (console_owner){....}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825
console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902
console_emit_next_record kernel/printk/printk.c:3177 [inline]
console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__report_bug.cold+0x15/0x137 lib/bug.c:243
report_bug+0xb2/0x220 lib/bug.c:281
handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:435
exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:489
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
lockdep_assert_rq_held kernel/sched/sched.h:1600 [inline]
lockdep_assert_rq_held kernel/sched/sched.h:1597 [inline]
update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
pick_next_task kernel/sched/core.c:6129 [inline]
__schedule+0x1b7d/0x6120 kernel/sched/core.c:6849
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7235
irqentry_exit+0x17b/0x670 kernel/entry/common.c:239
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
unwind_next_frame+0x501/0x1ea0 arch/x86/kernel/unwind_orc.c:527
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5238 [inline]
__kmalloc_noprof+0x301/0x850 mm/slub.c:5250
kmalloc_noprof include/linux/slab.h:954 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
__register_sysctl_table+0xac/0x1650 fs/proc/proc_sysctl.c:1379
__addrconf_sysctl_register+0x1a2/0x360 net/ipv6/addrconf.c:7327
addrconf_sysctl_register net/ipv6/addrconf.c:7375 [inline]
addrconf_sysctl_register+0x163/0x200 net/ipv6/addrconf.c:7364
ipv6_add_dev+0xaf2/0x1520 net/ipv6/addrconf.c:459
addrconf_notify+0x563/0x19c0 net/ipv6/addrconf.c:3654
notifier_call_chain+0x99/0x420 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2249
call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
call_netdevice_notifiers net/core/dev.c:2301 [inline]
register_netdevice+0x16e6/0x2210 net/core/dev.c:11460
register_netdev+0x34/0x50 net/core/dev.c:11538
sit_init_net+0x2c0/0x5f0 net/ipv6/sit.c:1859
ops_init+0x1e2/0x5f0 net/core/net_namespace.c:137
setup_net+0x118/0x3a0 net/core/net_namespace.c:446
copy_net_ns+0x46f/0x7c0 net/core/net_namespace.c:581
create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:130
unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x473/0xad0 kernel/fork.c:3174
__do_sys_unshare kernel/fork.c:3245 [inline]
__se_sys_unshare kernel/fork.c:3243 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:3243
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
console_owner --> &p->pi_lock --> &rq->__lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&rq->__lock);
lock(&p->pi_lock);
lock(&rq->__lock);
lock(console_owner);
*** DEADLOCK ***
6 locks held by syz.0.138/6342:
#0: ffffffff905fb270 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:577
#1: ffffffff90613ba8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock_killable include/linux/rtnetlink.h:145 [inline]
#1: ffffffff90613ba8 (rtnl_mutex){+.+.}-{4:4}, at: register_netdev+0x18/0x50 net/core/dev.c:11535
#2: ffffffff8e7e9220 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#2: ffffffff8e7e9220 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#2: ffffffff8e7e9220 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
#2: ffffffff8e7e9220 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x1ea0 arch/x86/kernel/unwind_orc.c:495
#3: ffff8880b843b2e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:655 [inline]
#3: ffff8880b843b2e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:639
#4: ffffffff8e7d5800 (console_lock){+.+.}-{0:0}, at: _printk+0xcf/0x110 kernel/printk/printk.c:2504
#5: ffffffff8e7d5878 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:317 [inline]
#5: ffffffff8e7d5878 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:428 [inline]
#5: ffffffff8e7d5878 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline]
#5: ffffffff8e7d5878 (console_srcu){....}-{0:0}, at: console_flush_one_record+0xfd/0xe50 kernel/printk/printk.c:3246
stack backtrace:
CPU: 0 UID: 0 PID: 6342 Comm: syz.0.138 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
lock_acquire kernel/locking/lockdep.c:5868 [inline]
lock_acquire+0x1cf/0x380 kernel/locking/lockdep.c:5825
console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902
console_emit_next_record kernel/printk/printk.c:3177 [inline]
console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
_printk+0xcf/0x110 kernel/printk/printk.c:2504
__report_bug.cold+0x15/0x137 lib/bug.c:243
report_bug+0xb2/0x220 lib/bug.c:281
handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:435
exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:489
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1600 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1597 [inline]
RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
Code: ab 48 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 18 9f ba 09 a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 40 0b 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc900034f7100 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853b280 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8de558ca RDI: ffffffff8c1af620
RBP: ffffc900034f72a8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90d9b217 R11: 0000000000000000 R12: ffffffff90d9e5e4
R13: ffff8880b853c0c0 R14: ffff88801e6e9e80 R15: ffff8880b853b280
pick_next_task kernel/sched/core.c:6129 [inline]
__schedule+0x1b7d/0x6120 kernel/sched/core.c:6849
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7235
irqentry_exit+0x17b/0x670 kernel/entry/common.c:239
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x501/0x1ea0 arch/x86/kernel/unwind_orc.c:527
Code: 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 bd 13 00 00 0f b6 41 05 83 e0 07 0f 84 53 fe ff ff 3c 01 0f 84 7b fe ff ff 4c 8d 41 04 <4c> 89 fe 48 b8 00 00 00 00 00 fc ff df 4c 89 c2 48 c1 ee 03 48 c1
RSP: 0018:ffffc900034f73b0 EFLAGS: 00000202
RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff918625b6
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff90fb1db8
RBP: ffffc900034f7468 R08: ffffffff918625ba R09: 0000000000000007
R10: 0000000000000200 R11: 00000000000167fd R12: ffffc900034f7470
R13: ffffc900034f7420 R14: ffffc900034f7455 R15: ffffffff918625bb
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5238 [inline]
__kmalloc_noprof+0x301/0x850 mm/slub.c:5250
kmalloc_noprof include/linux/slab.h:954 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
__register_sysctl_table+0xac/0x1650 fs/proc/proc_sysctl.c:1379
__addrconf_sysctl_register+0x1a2/0x360 net/ipv6/addrconf.c:7327
addrconf_sysctl_register net/ipv6/addrconf.c:7375 [inline]
addrconf_sysctl_register+0x163/0x200 net/ipv6/addrconf.c:7364
ipv6_add_dev+0xaf2/0x1520 net/ipv6/addrconf.c:459
addrconf_notify+0x563/0x19c0 net/ipv6/addrconf.c:3654
notifier_call_chain+0x99/0x420 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2249
call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
call_netdevice_notifiers net/core/dev.c:2301 [inline]
register_netdevice+0x16e6/0x2210 net/core/dev.c:11460
register_netdev+0x34/0x50 net/core/dev.c:11538
sit_init_net+0x2c0/0x5f0 net/ipv6/sit.c:1859
ops_init+0x1e2/0x5f0 net/core/net_namespace.c:137
setup_net+0x118/0x3a0 net/core/net_namespace.c:446
copy_net_ns+0x46f/0x7c0 net/core/net_namespace.c:581
create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:130
unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x473/0xad0 kernel/fork.c:3174
__do_sys_unshare kernel/fork.c:3245 [inline]
__se_sys_unshare kernel/fork.c:3243 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:3243
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc01ed9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef28b5d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fc01f015fa0 RCX: 00007fc01ed9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000080
RBP: 00007fc01ee32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc01f015fac R14: 00007fc01f015fa0 R15: 00007fc01f015fa0
debug_locks && !(lock_is_held(&(__rq_lockp(rq))->dep_map) != 0)
WARNING: kernel/sched/sched.h:1600 at lockdep_assert_rq_held kernel/sched/sched.h:1600 [inline], CPU#0: syz.0.138/6342
WARNING: kernel/sched/sched.h:1600 at lockdep_assert_rq_held kernel/sched/sched.h:1597 [inline], CPU#0: syz.0.138/6342
WARNING: kernel/sched/sched.h:1600 at update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850, CPU#0: syz.0.138/6342
Modules linked in:
CPU: 0 UID: 0 PID: 6342 Comm: syz.0.138 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1600 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1597 [inline]
RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
Code: ab 48 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 18 9f ba 09 a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 40 0b 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc900034f7100 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853b280 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8de558ca RDI: ffffffff8c1af620
RBP: ffffc900034f72a8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90d9b217 R11: 0000000000000000 R12: ffffffff90d9e5e4
R13: ffff8880b853c0c0 R14: ffff88801e6e9e80 R15: ffff8880b853b280
FS: 0000555589858500(0000) GS:ffff88812434e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c009136000 CR3: 0000000044360000 CR4: 00000000003526f0
Call Trace:
pick_next_task kernel/sched/core.c:6129 [inline]
__schedule+0x1b7d/0x6120 kernel/sched/core.c:6849
preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7235
irqentry_exit+0x17b/0x670 kernel/entry/common.c:239
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x501/0x1ea0 arch/x86/kernel/unwind_orc.c:527
Code: 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 bd 13 00 00 0f b6 41 05 83 e0 07 0f 84 53 fe ff ff 3c 01 0f 84 7b fe ff ff 4c 8d 41 04 <4c> 89 fe 48 b8 00 00 00 00 00 fc ff df 4c 89 c2 48 c1 ee 03 48 c1
RSP: 0018:ffffc900034f73b0 EFLAGS: 00000202
RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff918625b6
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff90fb1db8
RBP: ffffc900034f7468 R08: ffffffff918625ba R09: 0000000000000007
R10: 0000000000000200 R11: 00000000000167fd R12: ffffc900034f7470
R13: ffffc900034f7420 R14: ffffc900034f7455 R15: ffffffff918625bb
arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__do_kmalloc_node mm/slub.c:5238 [inline]
__kmalloc_noprof+0x301/0x850 mm/slub.c:5250
kmalloc_noprof include/linux/slab.h:954 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
__register_sysctl_table+0xac/0x1650 fs/proc/proc_sysctl.c:1379
__addrconf_sysctl_register+0x1a2/0x360 net/ipv6/addrconf.c:7327
addrconf_sysctl_register net/ipv6/addrconf.c:7375 [inline]
addrconf_sysctl_register+0x163/0x200 net/ipv6/addrconf.c:7364
ipv6_add_dev+0xaf2/0x1520 net/ipv6/addrconf.c:459
addrconf_notify+0x563/0x19c0 net/ipv6/addrconf.c:3654
notifier_call_chain+0x99/0x420 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2249
call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
call_netdevice_notifiers net/core/dev.c:2301 [inline]
register_netdevice+0x16e6/0x2210 net/core/dev.c:11460
register_netdev+0x34/0x50 net/core/dev.c:11538
sit_init_net+0x2c0/0x5f0 net/ipv6/sit.c:1859
ops_init+0x1e2/0x5f0 net/core/net_namespace.c:137
setup_net+0x118/0x3a0 net/core/net_namespace.c:446
copy_net_ns+0x46f/0x7c0 net/core/net_namespace.c:581
create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:130
unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x473/0xad0 kernel/fork.c:3174
__do_sys_unshare kernel/fork.c:3245 [inline]
__se_sys_unshare kernel/fork.c:3243 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:3243
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc01ed9c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef28b5d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fc01f015fa0 RCX: 00007fc01ed9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000080
RBP: 00007fc01ee32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc01f015fac R14: 00007fc01f015fa0 R15: 00007fc01f015fa0
----------------
Code disassembly (best guess):
0: 89 fa mov %edi,%edx
2: 83 e2 07 and $0x7,%edx
5: 38 d0 cmp %dl,%al
7: 7f 08 jg 0x11
9: 84 c0 test %al,%al
b: 0f 85 bd 13 00 00 jne 0x13ce
11: 0f b6 41 05 movzbl 0x5(%rcx),%eax
15: 83 e0 07 and $0x7,%eax
18: 0f 84 53 fe ff ff je 0xfffffe71
1e: 3c 01 cmp $0x1,%al
20: 0f 84 7b fe ff ff je 0xfffffea1
26: 4c 8d 41 04 lea 0x4(%rcx),%r8
* 2a: 4c 89 fe mov %r15,%rsi <-- trapping instruction
2d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
34: fc ff df
37: 4c 89 c2 mov %r8,%rdx
3a: 48 c1 ee 03 shr $0x3,%rsi
3e: 48 rex.W
3f: c1 .byte 0xc1