------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: timer_list hint: xprt_init_autodisconnect+0x0/0x230 net/sunrpc/xprt.c:185
WARNING: CPU: 1 PID: 32102 at lib/debugobjects.c:291 debug_print_object+0x166/0x220 lib/debugobjects.c:288
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 32102 Comm: syz-executor1 Not tainted 4.16.0-rc1+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
panic+0x1e4/0x41c kernel/panic.c:183
__warn+0x1dc/0x200 kernel/panic.c:547
report_bug+0x211/0x2d0 lib/bug.c:184
fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
fixup_bug arch/x86/kernel/traps.c:247 [inline]
do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:988
RIP: 0010:debug_print_object+0x166/0x220 lib/debugobjects.c:288
RSP: 0018:ffff8801db507738 EFLAGS: 00010086
RAX: dffffc0000000008 RBX: 0000000000000003 RCX: ffffffff815aaf3e
RDX: 0000000000000100 RSI: 1ffff1003b6a0e97 RDI: 1ffff1003b6a0e6c
RBP: ffff8801db507778 R08: 0000000000000000 R09: 1ffff1003b6a0e3e
R10: ffffed003b6a0f16 R11: ffffffff86b39478 R12: 0000000000000001
R13: ffffffff86b4ace0 R14: ffffffff86007c60 R15: ffffffff815fd9a0
__debug_check_no_obj_freed lib/debugobjects.c:745 [inline]
debug_check_no_obj_freed+0x662/0xf1f lib/debugobjects.c:774
kfree+0xc7/0x260 mm/slab.c:3799
__rcu_reclaim kernel/rcu/rcu.h:167 [inline]
rcu_do_batch kernel/rcu/tree.c:2674 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2900 [inline]
rcu_process_callbacks+0xe94/0x17f0 kernel/rcu/tree.c:2917
__do_softirq+0x2d7/0xb85 kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x1cc/0x200 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:541 [inline]
smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052
apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:829
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:142 [inline]
RIP: 0010:PageSlab include/linux/page-flags.h:271 [inline]
RIP: 0010:page_mapcount include/linux/mm.h:588 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1338 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1441 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1470 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1491 [inline]
RIP: 0010:unmap_page_range+0xfdd/0x22e0 mm/memory.c:1512
RSP: 0018:ffff8801ceff7120 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12
RAX: 1ffffd4000d06284 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffed0039dfee18
RBP: ffff8801ceff75c8 R08: 0000000000000000 R09: 1ffff10039dfedb0
R10: ffff8801ceff6cb8 R11: 0000000000000001 R12: 00007f060846d000
R13: ffffea0006831400 R14: ffff88019e2c5360 R15: ffff8801ceff73a0
unmap_single_vma+0x15f/0x2d0 mm/memory.c:1557
unmap_vmas+0xf1/0x1b0 mm/memory.c:1587
exit_mmap+0x23a/0x500 mm/mmap.c:3020
__mmput kernel/fork.c:971 [inline]
mmput+0x223/0x6c0 kernel/fork.c:992
exit_mm kernel/exit.c:544 [inline]
do_exit+0x90a/0x1ad0 kernel/exit.c:852
do_group_exit+0x149/0x400 kernel/exit.c:968
SYSC_exit_group kernel/exit.c:979 [inline]
SyS_exit_group+0x1d/0x20 kernel/exit.c:977
do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x26/0x9b
RIP: 0033:0x453a59
RSP: 002b:00007ffc46bf9ad8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001d RCX: 0000000000453a59
RDX: 0000000000453a59 RSI: 00000000007214f8 RDI: 0000000000000000
RBP: 00007ffc46bf9b30 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffc46bf9a70 R11: 0000000000000246 R12: 00007ffc46bfa1b0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000002996914
======================================================
WARNING: possible circular locking dependency detected
4.16.0-rc1+ #14 Not tainted
------------------------------------------------------
syz-executor1/32102 is trying to acquire lock:
((console_sem).lock){-.-.}, at: [<00000000902a3b13>] down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
but task is already holding lock:
(&obj_hash[i].lock){-.-.}, at: [<00000000905ec9a2>] __debug_check_no_obj_freed lib/debugobjects.c:736 [inline]
(&obj_hash[i].lock){-.-.}, at: [<00000000905ec9a2>] debug_check_no_obj_freed+0x1e9/0xf1f lib/debugobjects.c:774
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&obj_hash[i].lock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
__debug_object_init+0x109/0x1040 lib/debugobjects.c:343
debug_object_init+0x17/0x20 lib/debugobjects.c:391
debug_hrtimer_init kernel/time/hrtimer.c:410 [inline]
debug_init kernel/time/hrtimer.c:458 [inline]
hrtimer_init+0x8c/0x410 kernel/time/hrtimer.c:1259
init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1060
__sched_fork+0x2bb/0xb60 kernel/sched/core.c:2189
init_idle+0x75/0x820 kernel/sched/core.c:5347
sched_init+0xb19/0xc43 kernel/sched/core.c:6044
start_kernel+0x452/0x819 init/main.c:585
x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378
x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
-> #2 (&rq->lock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144
rq_lock kernel/sched/sched.h:1760 [inline]
task_fork_fair+0x7a/0x690 kernel/sched/fair.c:9471
sched_fork+0x450/0xc10 kernel/sched/core.c:2405
copy_process.part.37+0x1758/0x4b60 kernel/fork.c:1774
copy_process kernel/fork.c:1617 [inline]
_do_fork+0x1f7/0xf70 kernel/fork.c:2098
kernel_thread+0x34/0x40 kernel/fork.c:2157
rest_init+0x22/0xf0 init/main.c:402
start_kernel+0x7f1/0x819 init/main.c:716
x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378
x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
-> #1 (&p->pi_lock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
try_to_wake_up+0xbc/0x15f0 kernel/sched/core.c:1989
wake_up_process+0x10/0x20 kernel/sched/core.c:2152
__up.isra.0+0x1cc/0x2c0 kernel/locking/semaphore.c:262
up+0x13b/0x1d0 kernel/locking/semaphore.c:187
__up_console_sem+0xb2/0x1a0 kernel/printk/printk.c:242
console_unlock+0x5af/0xfb0 kernel/printk/printk.c:2417
do_con_write+0x106e/0x1f70 drivers/tty/vt/vt.c:2433
con_write+0x25/0xb0 drivers/tty/vt/vt.c:2782
process_output_block drivers/tty/n_tty.c:579 [inline]
n_tty_write+0x5ef/0xec0 drivers/tty/n_tty.c:2302
do_tty_write drivers/tty/tty_io.c:949 [inline]
tty_write+0x3fa/0x840 drivers/tty/tty_io.c:1033
__vfs_write+0xef/0x970 fs/read_write.c:480
vfs_write+0x189/0x510 fs/read_write.c:544
SYSC_write fs/read_write.c:589 [inline]
SyS_write+0xef/0x220 fs/read_write.c:581
do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x26/0x9b
-> #0 ((console_sem).lock){-.-.}:
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
__down_trylock_console_sem+0xa2/0x1e0 kernel/printk/printk.c:225
console_trylock+0x15/0x70 kernel/printk/printk.c:2229
console_trylock_spinning kernel/printk/printk.c:1643 [inline]
vprintk_emit+0x5b5/0xb90 kernel/printk/printk.c:1906
vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379
printk+0xaa/0xca kernel/printk/printk.c:1980
__warn_printk+0x90/0xf0 kernel/panic.c:599
debug_print_object+0x166/0x220 lib/debugobjects.c:288
__debug_check_no_obj_freed lib/debugobjects.c:745 [inline]
debug_check_no_obj_freed+0x662/0xf1f lib/debugobjects.c:774
kfree+0xc7/0x260 mm/slab.c:3799
__rcu_reclaim kernel/rcu/rcu.h:167 [inline]
rcu_do_batch kernel/rcu/tree.c:2674 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2900 [inline]
rcu_process_callbacks+0xe94/0x17f0 kernel/rcu/tree.c:2917
__do_softirq+0x2d7/0xb85 kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x1cc/0x200 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:541 [inline]
smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052
apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:829
__read_once_size include/linux/compiler.h:183 [inline]
compound_head include/linux/page-flags.h:142 [inline]
PageSlab include/linux/page-flags.h:271 [inline]
page_mapcount include/linux/mm.h:588 [inline]
zap_pte_range mm/memory.c:1338 [inline]
zap_pmd_range mm/memory.c:1441 [inline]
zap_pud_range mm/memory.c:1470 [inline]
zap_p4d_range mm/memory.c:1491 [inline]
unmap_page_range+0xfdd/0x22e0 mm/memory.c:1512
unmap_single_vma+0x15f/0x2d0 mm/memory.c:1557
unmap_vmas+0xf1/0x1b0 mm/memory.c:1587
exit_mmap+0x23a/0x500 mm/mmap.c:3020
__mmput kernel/fork.c:971 [inline]
mmput+0x223/0x6c0 kernel/fork.c:992
exit_mm kernel/exit.c:544 [inline]
do_exit+0x90a/0x1ad0 kernel/exit.c:852
do_group_exit+0x149/0x400 kernel/exit.c:968
SYSC_exit_group kernel/exit.c:979 [inline]
SyS_exit_group+0x1d/0x20 kernel/exit.c:977
do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x26/0x9b
other info that might help us debug this:
Chain exists of:
(console_sem).lock --> &rq->lock --> &obj_hash[i].lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&obj_hash[i].lock);
lock(&rq->lock);
lock(&obj_hash[i].lock);
lock((console_sem).lock);
*** DEADLOCK ***
3 locks held by syz-executor1/32102:
#0: (&(ptlock_ptr(page))->rlock#2){+.+.}, at: [<00000000b186f502>] spin_lock include/linux/spinlock.h:310 [inline]
#0: (&(ptlock_ptr(page))->rlock#2){+.+.}, at: [<00000000b186f502>] zap_pte_range mm/memory.c:1298 [inline]
#0: (&(ptlock_ptr(page))->rlock#2){+.+.}, at: [<00000000b186f502>] zap_pmd_range mm/memory.c:1441 [inline]
#0: (&(ptlock_ptr(page))->rlock#2){+.+.}, at: [<00000000b186f502>] zap_pud_range mm/memory.c:1470 [inline]
#0: (&(ptlock_ptr(page))->rlock#2){+.+.}, at: [<00000000b186f502>] zap_p4d_range mm/memory.c:1491 [inline]
#0: (&(ptlock_ptr(page))->rlock#2){+.+.}, at: [<00000000b186f502>] unmap_page_range+0xc5d/0x22e0 mm/memory.c:1512
#1: (rcu_callback){....}, at: [<000000007e5d2146>] __rcu_reclaim kernel/rcu/rcu.h:162 [inline]
#1: (rcu_callback){....}, at: [<000000007e5d2146>] rcu_do_batch kernel/rcu/tree.c:2674 [inline]
#1: (rcu_callback){....}, at: [<000000007e5d2146>] invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline]
#1: (rcu_callback){....}, at: [<000000007e5d2146>] __rcu_process_callbacks kernel/rcu/tree.c:2900 [inline]
#1: (rcu_callback){....}, at: [<000000007e5d2146>] rcu_process_callbacks+0xe57/0x17f0 kernel/rcu/tree.c:2917
#2: (&obj_hash[i].lock){-.-.}, at: [<00000000905ec9a2>] __debug_check_no_obj_freed lib/debugobjects.c:736 [inline]
#2: (&obj_hash[i].lock){-.-.}, at: [<00000000905ec9a2>] debug_check_no_obj_freed+0x1e9/0xf1f lib/debugobjects.c:774
stack backtrace:
CPU: 1 PID: 32102 Comm: syz-executor1 Not tainted 4.16.0-rc1+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
print_circular_bug.isra.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223
check_prev_add kernel/locking/lockdep.c:1863 [inline]
check_prevs_add kernel/locking/lockdep.c:1976 [inline]
validate_chain kernel/locking/lockdep.c:2417 [inline]
__lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3431
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
__down_trylock_console_sem+0xa2/0x1e0 kernel/printk/printk.c:225
console_trylock+0x15/0x70 kernel/printk/printk.c:2229
console_trylock_spinning kernel/printk/printk.c:1643 [inline]
vprintk_emit+0x5b5/0xb90 kernel/printk/printk.c:1906
vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379
printk+0xaa/0xca kernel/printk/printk.c:1980
__warn_printk+0x90/0xf0 kernel/panic.c:599
debug_print_object+0x166/0x220 lib/debugobjects.c:288
__debug_check_no_obj_freed lib/debugobjects.c:745 [inline]
debug_check_no_obj_freed+0x662/0xf1f lib/debugobjects.c:774
kfree+0xc7/0x260 mm/slab.c:3799
__rcu_reclaim kernel/rcu/rcu.h:167 [inline]
rcu_do_batch kernel/rcu/tree.c:2674 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:2933 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2900 [inline]
rcu_process_callbacks+0xe94/0x17f0 kernel/rcu/tree.c:2917
__do_softirq+0x2d7/0xb85 kernel/softirq.c:285
invoke_softirq kernel/softirq.c:365 [inline]
irq_exit+0x1cc/0x200 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:541 [inline]
smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052
apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:829
RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:142 [inline]
RIP: 0010:PageSlab include/linux/page-flags.h:271 [inline]
RIP: 0010:page_mapcount include/linux/mm.h:588 [inline]
RIP: 0010:zap_pte_range mm/memory.c:1338 [inline]
RIP: 0010:zap_pmd_range mm/memory.c:1441 [inline]
RIP: 0010:zap_pud_range mm/memory.c:1470 [inline]
RIP: 0010:zap_p4d_range mm/memory.c:1491 [inline]
RIP: 0010:unmap_page_range+0xfdd/0x22e0 mm/memory.c:1512
RSP: 0018:ffff8801ceff7120 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12
RAX: 1ffffd4000d06284 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffffed0039dfee18
RBP: ffff8801ceff75c8 R08: 0000000000000000 R09: 1ffff10039dfedb0
R10: ffff8801ceff6cb8 R11: 0000000000000001 R12: 00007f060846d000
R13: ffffea0006831400 R14: ffff88019e2c5360 R15: ffff8801ceff73a0
unmap_single_vma+0x15f/0x2d0 mm/memory.c:1557
unmap_vmas+0xf1/0x1b0 mm/memory.c:1587
exit_mmap+0x23a/0x500 mm/mmap.c:3020
Lost 55 message(s)!
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..