Re: general protection fault in __delayacct_blkio_end

From: syzbot
Date: Fri Jun 15 2018 - 13:43:08 EST

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syzbot has found a reproducer for the following crash on:

HEAD commit: 4c5e8fc62d6a Merge tag 'linux-kselftest-4.18-rc1-2' of git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15fa558f800000
kernel config: https://syzkaller.appspot.com/x/.config?x=caf58998a7a0564
dashboard link: https://syzkaller.appspot.com/bug?extid=aea12292cfdadf454c38
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=14ee4aff800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=108628c0400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+aea12292cfdadf454c38@xxxxxxxxxxxxxxxxxxxxxxxxx

name failslab, interval 1, probability 0, space 0, times 0
kasan: CONFIG_KASAN_INLINE enabled
CPU: 1 PID: 4798 Comm: syz-executor422 Not tainted 4.17.0+ #104
kasan: GPF could be caused by NULL-ptr deref or user memory access
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
general protection fault: 0000 [#1] SMP KASAN
Call Trace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0+ #104
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__delayacct_blkio_end+0x4f/0xc0 kernel/delayacct.c:83
Code: 48
c1
ea 03
80
3c
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149
02
00
0f
85 80
00
00
00
48
__should_failslab+0x124/0x180 mm/failslab.c:32
8b
should_failslab+0x9/0x14 mm/slab_common.c:1553
9b
slab_pre_alloc_hook mm/slab.h:423 [inline]
slab_alloc mm/slab.c:3378 [inline]
kmem_cache_alloc+0x2af/0x760 mm/slab.c:3552
48
12
kmem_cache_zalloc include/linux/slab.h:697 [inline]
__delayacct_tsk_init+0x20/0x80 kernel/delayacct.c:45
00
delayacct_tsk_init include/linux/delayacct.h:105 [inline]
copy_process.part.39+0x2ba8/0x7250 kernel/fork.c:1687
00
48
b8
00
00
00
00
00
fc
ff
df
48
8d
7b
38
48
89
fa
48
c1
ea
03
<0f>
b6
04
02
84
c0 74
04 3c
03 7e
51
44 8b
63 38
31 ff
41 83
e4 01
RSP: 0000:ffff8801dae06c28 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8801d9778538
RDX: 0000000000000007 RSI: ffffffff817cba01 RDI: 0000000000000038
RBP: ffff8801dae06c40 R08: ffffed003b5c46d7 R09: 0000000000000000
R10: ffff8801dae06d50 R11: ffff8801dae236b3 R12: ffffffff88e75dc0
R13: ffff8801d9778500 R14: ffff8801d977853c R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000008e6a000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
copy_process kernel/fork.c:1616 [inline]
_do_fork+0x291/0x12a0 kernel/fork.c:2099
<IRQ>
delayacct_blkio_end include/linux/delayacct.h:128 [inline]
try_to_wake_up+0xacb/0x12b0 kernel/sched/core.c:2057
default_wake_function+0x30/0x50 kernel/sched/core.c:3742
__do_sys_clone kernel/fork.c:2206 [inline]
__se_sys_clone kernel/fork.c:2200 [inline]
__x64_sys_clone+0xbf/0x150 kernel/fork.c:2200
autoremove_wake_function+0x80/0x370 kernel/sched/wait.c:373
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
wake_bit_function+0xcb/0x160 kernel/sched/wait_bit.c:30
__wake_up_common+0x191/0x740 kernel/sched/wait.c:90
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441519
Code:
e8
ac
b5
02
00
__wake_up_common_lock+0x1c2/0x330 kernel/sched/wait.c:119
48
83
c4
18
c3
__wake_up+0xe/0x10 kernel/sched/wait.c:143
0f
__wake_up_bit+0x1af/0x290 kernel/sched/wait_bit.c:125
1f
80
00
00
00
00
48
89
wake_up_bit+0x3d/0x40 kernel/sched/wait_bit.c:148
f8
journal_end_buffer_io_sync+0xa4/0xe0 fs/jbd2/commit.c:44
48
end_bio_bh_io_sync+0xf3/0x140 fs/buffer.c:2969
89
f7
bio_endio+0x530/0x9e0 block/bio.c:1836
48
89
d6
48
89
ca
4d
89
req_bio_endio block/blk-core.c:281 [inline]
blk_update_request+0x3b2/0xcd0 block/blk-core.c:3091
c2
4d
89
c8
scsi_end_request+0xde/0x890 drivers/scsi/scsi_lib.c:672
4c
8b
scsi_io_completion+0xcc6/0x1dd0 drivers/scsi/scsi_lib.c:898
4c
24
08
0f
scsi_finish_command+0x54a/0x8f0 drivers/scsi/scsi.c:248
05
<48>
3d
01
f0
ff
ff
0f
83
1b
09
scsi_softirq_done+0x3f6/0x4d0 drivers/scsi/scsi_lib.c:1687
fc
ff
c3
66
__blk_mq_complete_request block/blk-mq.c:583 [inline]
blk_mq_complete_request+0x355/0x630 block/blk-mq.c:620
2e
scsi_mq_done+0xe7/0x450 drivers/scsi/scsi_lib.c:1998
0f
1f
84
00
00
virtscsi_complete_cmd+0x573/0x740 drivers/scsi/virtio_scsi.c:207
00
00
virtscsi_vq_done+0xcb/0x180 drivers/scsi/virtio_scsi.c:223
RSP: 002b:00007ffc2ba79078 EFLAGS: 00000246
ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441519
RDX: 0000000020000440 RSI: 0000000020000340 RDI: 0000000000000000
RBP: 00007ffc2ba79090 R08: 00000000200004c0 R09: 0000000000000001
virtscsi_req_done+0xa7/0xd0 drivers/scsi/virtio_scsi.c:238
R10: 0000000020000480 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000
vring_interrupt+0x128/0x170 drivers/virtio/virtio_ring.c:950
__handle_irq_event_percpu+0x1c8/0xaf0 kernel/irq/handle.c:149
handle_irq_event_percpu+0xa0/0x1d0 kernel/irq/handle.c:189
handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206
handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791
generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77
do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245
common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642
</IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
Code: c7 48 89 45 d8 e8 6a 91 27 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 59 91 27 fa eb 8a 90 90 90 90 90 90 90 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90
RSP: 0000:ffffffff88e07bc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda
RAX: dffffc0000000000 RBX: 1ffffffff11c0f7b RCX: 0000000000000000
RDX: 1ffffffff11e3600 RSI: 0000000000000001 RDI: ffffffff88f1b000
RBP: ffffffff88e07bc0 R08: ffffed003b5c46d7 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff88e07c78 R14: ffffffff899ea9e0 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0xc7/0x450 arch/x86/kernel/process.c:500
arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:491
default_idle_call+0x6d/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x3aa/0x570 kernel/sched/idle.c:262
cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368
rest_init+0xe1/0xe4 init/main.c:442
start_kernel+0x90e/0x949 init/main.c:738
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452
x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)

======================================================
WARNING: possible circular locking dependency detected
4.17.0+ #104 Not tainted
------------------------------------------------------
swapper/0/0 is trying to acquire lock:
(____ptrval____) ((console_sem).lock){-...}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136

but task is already holding lock:
(____ptrval____) (&p->pi_lock){-.-.}, at: try_to_wake_up+0xd2/0x12b0 kernel/sched/core.c:1986

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #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+0xd2/0x12b0 kernel/sched/core.c:1986
wake_up_process+0x10/0x20 kernel/sched/core.c:2149
__up.isra.1+0x1c0/0x2a0 kernel/locking/semaphore.c:262
up+0x13c/0x1c0 kernel/locking/semaphore.c:187
__up_console_sem+0xbe/0x1b0 kernel/printk/printk.c:242
console_unlock+0x7a2/0x10b0 kernel/printk/printk.c:2411
vprintk_emit+0x6c6/0xdf0 kernel/printk/printk.c:1907
vprintk_default+0x28/0x30 kernel/printk/printk.c:1948
vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:382
printk+0xa7/0xcf kernel/printk/printk.c:1981
load_umh+0x51/0xbd net/bpfilter/bpfilter_kern.c:99
do_one_initcall+0x127/0x913 init/main.c:884
do_initcall_level init/main.c:952 [inline]
do_initcalls init/main.c:960 [inline]
do_basic_setup init/main.c:978 [inline]
kernel_init_freeable+0x49b/0x58e init/main.c:1135
kernel_init+0x11/0x1b3 init/main.c:1061
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412

-> #0 ((console_sem).lock){-...}:
lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924
__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+0xae/0x200 kernel/printk/printk.c:225
console_trylock+0x15/0xa0 kernel/printk/printk.c:2230
console_trylock_spinning kernel/printk/printk.c:1643 [inline]
vprintk_emit+0x6ad/0xdf0 kernel/printk/printk.c:1906
vprintk_default+0x28/0x30 kernel/printk/printk.c:1948
vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:382
printk+0xa7/0xcf kernel/printk/printk.c:1981
kasan_die_handler.cold.22+0x11/0x30 arch/x86/mm/kasan_init_64.c:251
notifier_call_chain+0x180/0x390 kernel/notifier.c:93
__atomic_notifier_call_chain kernel/notifier.c:183 [inline]
atomic_notifier_call_chain+0x98/0x190 kernel/notifier.c:193
notify_die+0x1be/0x2e0 kernel/notifier.c:549
do_general_protection+0x248/0x2f0 arch/x86/kernel/traps.c:559
general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1159
__delayacct_blkio_end+0x4f/0xc0 kernel/delayacct.c:83
delayacct_blkio_end include/linux/delayacct.h:128 [inline]
try_to_wake_up+0xacb/0x12b0 kernel/sched/core.c:2057
default_wake_function+0x30/0x50 kernel/sched/core.c:3742
autoremove_wake_function+0x80/0x370 kernel/sched/wait.c:373
wake_bit_function+0xcb/0x160 kernel/sched/wait_bit.c:30
__wake_up_common+0x191/0x740 kernel/sched/wait.c:90
__wake_up_common_lock+0x1c2/0x330 kernel/sched/wait.c:119
__wake_up+0xe/0x10 kernel/sched/wait.c:143
__wake_up_bit+0x1af/0x290 kernel/sched/wait_bit.c:125
wake_up_bit+0x3d/0x40 kernel/sched/wait_bit.c:148
journal_end_buffer_io_sync+0xa4/0xe0 fs/jbd2/commit.c:44
end_bio_bh_io_sync+0xf3/0x140 fs/buffer.c:2969
bio_endio+0x530/0x9e0 block/bio.c:1836
req_bio_endio block/blk-core.c:281 [inline]
blk_update_request+0x3b2/0xcd0 block/blk-core.c:3091
scsi_end_request+0xde/0x890 drivers/scsi/scsi_lib.c:672
scsi_io_completion+0xcc6/0x1dd0 drivers/scsi/scsi_lib.c:898
scsi_finish_command+0x54a/0x8f0 drivers/scsi/scsi.c:248
scsi_softirq_done+0x3f6/0x4d0 drivers/scsi/scsi_lib.c:1687
__blk_mq_complete_request block/blk-mq.c:583 [inline]
blk_mq_complete_request+0x355/0x630 block/blk-mq.c:620
scsi_mq_done+0xe7/0x450 drivers/scsi/scsi_lib.c:1998
virtscsi_complete_cmd+0x573/0x740 drivers/scsi/virtio_scsi.c:207
virtscsi_vq_done+0xcb/0x180 drivers/scsi/virtio_scsi.c:223
virtscsi_req_done+0xa7/0xd0 drivers/scsi/virtio_scsi.c:238
vring_interrupt+0x128/0x170 drivers/virtio/virtio_ring.c:950
__handle_irq_event_percpu+0x1c8/0xaf0 kernel/irq/handle.c:149
handle_irq_event_percpu+0xa0/0x1d0 kernel/irq/handle.c:189
handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206
handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791
generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77
do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245
ret_from_intr+0x0/0x1e
native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0xc7/0x450 arch/x86/kernel/process.c:500
arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:491
default_idle_call+0x6d/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x3aa/0x570 kernel/sched/idle.c:262
cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368
rest_init+0xe1/0xe4 init/main.c:442
start_kernel+0x90e/0x949 init/main.c:738
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452
x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242

other info that might help us debug this:

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(&p->pi_lock);
lock((console_sem).lock);
lock(&p->pi_lock);
lock((console_sem).lock);

*** DEADLOCK ***

4 locks held by swapper/0/0:
#0: (____ptrval____) (&(&virtscsi_vq->vq_lock)->rlock){-.-.}, at: virtscsi_vq_done+0xa5/0x180 drivers/scsi/virtio_scsi.c:219
#1: (____ptrval____) (bit_wait_table + i){-.-.}, at: __wake_up_common_lock+0x19e/0x330 kernel/sched/wait.c:118
#2: (____ptrval____) (&p->pi_lock){-.-.}, at: try_to_wake_up+0xd2/0x12b0 kernel/sched/core.c:1986
#3: (____ptrval____) (rcu_read_lock){....}, at: atomic_notifier_call_chain+0x0/0x190 kernel/notifier.c:329

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0+ #104
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
print_circular_bug.isra.36.cold.56+0x1bd/0x27d kernel/locking/lockdep.c:1227
check_prev_add kernel/locking/lockdep.c:1867 [inline]
check_prevs_add kernel/locking/lockdep.c:1980 [inline]
validate_chain kernel/locking/lockdep.c:2421 [inline]
__lock_acquire+0x3449/0x5020 kernel/locking/lockdep.c:3435
lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924
__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+0xae/0x200 kernel/printk/printk.c:225
console_trylock+0x15/0xa0 kernel/printk/printk.c:2230
console_trylock_spinning kernel/printk/printk.c:1643 [inline]
vprintk_emit+0x6ad/0xdf0 kernel/printk/printk.c:1906
vprintk_default+0x28/0x30 kernel/printk/printk.c:1948
vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:382
printk+0xa7/0xcf kernel/printk/printk.c:1981
kasan_die_handler.cold.22+0x11/0x30 arch/x86/mm/kasan_init_64.c:251
notifier_call_chain+0x180/0x390 kernel/notifier.c:93
__atomic_notifier_call_chain kernel/notifier.c:183 [inline]
atomic_notifier_call_chain+0x98/0x190 kernel/notifier.c:193
notify_die+0x1be/0x2e0 kernel/notifier.c:549
do_general_protection+0x248/0x2f0 arch/x86/kernel/traps.c:559
general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1159
RIP: 0010:__delayacct_blkio_end+0x4f/0xc0 kernel/delayacct.c:83
Code: 48 c1 ea 03 80 3c 02 00 0f 85 80 00 00 00 48 8b 9b 48 12 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 38 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 51 44 8b 63 38 31 ff 41 83 e4 01
RSP: 0000:ffff8801dae06c28 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8801d9778538
RDX: 0000000000000007 RSI: ffffffff817cba01 RDI: 0000000000000038
RBP: ffff8801dae06c40 R08: ffffed003b5c46d7 R09: 0000000000000000
R10: ffff8801dae06d50 R11: ffff8801dae236b3 R12: ffffffff88e75dc0
R13: ffff8801d9778500 R14: ffff8801d977853c R15: 0000000000000002
delayacct_blkio_end include/linux/delayacct.h:128 [inline]
try_to_wake_up+0xacb/0x12b0 kernel/sched/core.c:2057
default_wake_function+0x30/0x50 kernel/sched/core.c:3742
autoremove_wake_function+0x80/0x370 kernel/sched/wait.c:373
wake_bit_function+0xcb/0x160 kernel/sched/wait_bit.c:30
__wake_up_common+0x191/0x740 kernel/sched/wait.c:90
__wake_up_common_lock+0x1c2/0x330 kernel/sched/wait.c:119
__wake_up+0xe/0x10 kernel/sched/wait.c:143
__wake_up_bit+0x1af/0x290 kernel/sched/wait_bit.c:125
wake_up_bit+0x3d/0x40 kernel/sched/wait_bit.c:148
journal_end_buffer_io
Lost 167 message(s)!
---[ end trace 9ef680b141ad1ec6 ]---
RIP: 0010:__delayacct_blkio_end+0x4f/0xc0 kernel/delayacct.c:83
Code: 48 c1 ea 03 80 3c 02 00 0f 85 80 00 00 00 48 8b 9b 48 12 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 38 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 51 44 8b 63 38 31 ff 41 83 e4 01
RSP: 0000:ffff8801dae06c28 EFLAGS: 00010002
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8801d9778538
RDX: 0000000000000007 RSI: ffffffff817cba01 RDI: 0000000000000038
RBP: ffff8801dae06c40 R08: ffffed003b5c46d7 R09: 0000000000000000
R10: ffff8801dae06d50 R11: ffff8801dae236b3 R12: ffffffff88e75dc0
R13: ffff8801d9778500 R14: ffff8801d977853c R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000008e6a000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Next message: Stephen Boyd: "Re: ACPI support in common clock framework"
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