INFO: task hung in generic_file_read_iter (2)
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syzbot
Mar 31, 2018, 4:50:39 PM3/31/18
to syzkaller-upst...@googlegroups.com
Hello,
syzbot hit the following crash on upstream commit
c2a9838452a4d71f76103c18c926468a9ea05713 (Fri Mar 30 05:27:12 2018 +0000)
Merge tag 'for-4.16/dm-fixes-4' of
git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=626c255917c3dfd56a06
Unfortunately, I don't have any reproducer for this crash yet.
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=5866410660069376
Kernel config:
https://syzkaller.appspot.com/x/.config?id=-8440362230543204781
compiler: gcc (GCC) 7.1.1 20170620
user-space arch: i386
CC: [a...@linux.intel.com ak...@linux-foundation.org arya...@virtuozzo.com
ja...@suse.cz jla...@redhat.com linux-...@vger.kernel.org
linu...@kvack.org mgo...@techsingularity.net rgol...@suse.com
vi...@zeniv.linux.org.uk]
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+626c25...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
Buffer I/O error on dev loop0, logical block 6, lost async page write
Buffer I/O error on dev loop0, logical block 7, lost async page write
Buffer I/O error on dev loop0, logical block 8, lost async page write
Buffer I/O error on dev loop0, logical block 9, lost async page write
random: crng init done
INFO: task syz-executor3:23174 blocked for more than 120 seconds.
Not tainted 4.16.0-rc7+ #281
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3 D20032 23174 13872 0x20020004
Call Trace:
context_switch kernel/sched/core.c:2862 [inline]
__schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440
schedule+0xf5/0x430 kernel/sched/core.c:3499
io_schedule+0x1c/0x70 kernel/sched/core.c:5115
wait_on_page_bit_common+0x4b3/0x770 mm/filemap.c:1099
wait_on_page_bit mm/filemap.c:1132 [inline]
wait_on_page_writeback include/linux/pagemap.h:546 [inline]
__filemap_fdatawait_range+0x282/0x430 mm/filemap.c:533
filemap_fdatawait_range mm/filemap.c:558 [inline]
filemap_write_and_wait_range+0x74/0xc0 mm/filemap.c:659
generic_file_read_iter+0x409/0x28e0 mm/filemap.c:2334
blkdev_read_iter+0x105/0x170 fs/block_dev.c:1928
call_read_iter include/linux/fs.h:1776 [inline]
generic_file_splice_read+0x3f9/0x7b0 fs/splice.c:307
do_splice_to+0x10a/0x160 fs/splice.c:880
splice_direct_to_actor+0x242/0x820 fs/splice.c:952
do_splice_direct+0x29b/0x3c0 fs/splice.c:1061
do_sendfile+0x5c9/0xe80 fs/read_write.c:1413
C_SYSC_sendfile fs/read_write.c:1489 [inline]
compat_SyS_sendfile+0xea/0x1a0 fs/read_write.c:1478
do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f46c99
RSP: 002b:00000000f769d09c EFLAGS: 00000286 ORIG_RAX: 00000000000000bb
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000000000013
RDX: 0000000020000080 RSI: 0000000002000004 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
3 locks held by kworker/u4:0/5:
#0: ((wq_completion)"writeback"){+.+.}, at: [<00000000d67eb335>]
work_static include/linux/workqueue.h:198 [inline]
#0: ((wq_completion)"writeback"){+.+.}, at: [<00000000d67eb335>]
set_work_data kernel/workqueue.c:619 [inline]
#0: ((wq_completion)"writeback"){+.+.}, at: [<00000000d67eb335>]
set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ((wq_completion)"writeback"){+.+.}, at: [<00000000d67eb335>]
process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084
#1: ((work_completion)(&(&wb->dwork)->work)){+.+.}, at:
[<0000000025b154ed>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088
#2: (&type->s_umount_key#33){++++}, at: [<00000000acd1e72d>]
trylock_super+0x20/0x100 fs/super.c:395
2 locks held by khungtaskd/868:
#0: (rcu_read_lock){....}, at: [<00000000224e260f>]
check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000224e260f>] watchdog+0x1c5/0xd60
kernel/hung_task.c:249
#1: (tasklist_lock){.+.?}, at: [<00000000c0944745>]
debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
2 locks held by getty/4414:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4415:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4416:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4417:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4418:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4419:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4420:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
1 lock held by syz-executor1/23158:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000010e661b>]
iterate_bdevs+0xc8/0x260 fs/block_dev.c:2160
1 lock held by syz-executor5/23184:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000ea362300>]
__blkdev_get+0x176/0x13b0 fs/block_dev.c:1458
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 868 Comm: khungtaskd Not tainted 4.16.0-rc7+ #281
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+0x194/0x24d lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.16.0-rc7+ #281
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:76 [inline]
RIP: 0010:rcu_read_lock_sched_notrace include/linux/rcupdate.h:754 [inline]
RIP: 0010:trace_softirq_raise include/trace/events/irq.h:156 [inline]
RIP: 0010:__raise_softirq_irqoff kernel/softirq.c:443 [inline]
RIP: 0010:raise_softirq_irqoff+0x220/0x320 kernel/softirq.c:417
RSP: 0018:ffff8801db207c90 EFLAGS: 00000083
RAX: 0000000000000000 RBX: 1ffff1003b640f93 RCX: dffffc0000000000
RDX: 1ffff1003b645a0a RSI: 1ffff1003b640fc5 RDI: 0000000000000007
RBP: ffff8801db207d60 R08: 1ffff1003b6459fd R09: ffff88021fff8008
R10: ffff88021fff8010 R11: ffff88021fff801d R12: 0000000000000007
R13: ffff8801db207d38 R14: ffff8801db207e68 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 0000000007a22001 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
scheduler_ipi+0x50b/0x820 kernel/sched/core.c:1802
smp_reschedule_interrupt+0xe6/0x650 arch/x86/kernel/smp.c:277
reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:881
</IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffffffff87a07c38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
RAX: dffffc0000000000 RBX: 1ffffffff0f40f8a RCX: 0000000000000000
RDX: 1ffffffff0f59580 RSI: 0000000000000001 RDI: ffffffff87acac00
RBP: ffffffff87a07c38 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff87a07cf0 R14: ffffffff883b4820 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0xbf/0x430 arch/x86/kernel/process.c:354
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:345
default_idle_call+0x36/0x90 kernel/sched/idle.c:98
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x24a/0x3b0 kernel/sched/idle.c:246
cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:351
rest_init+0xed/0xf0 init/main.c:437
start_kernel+0x7f1/0x819 init/main.c:717
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:239
Code: 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 d4 00 00 00 4d 8b 3e 4d 85 ff 75
b6 65 ff 0d cc 38 be 7e e9 62 fe ff ff 65 ff 05 c0 38 be 7e <49> 8d 45 c0
48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 48 01 d0
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzk...@googlegroups.com.
syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
report.
Note: all commands must start from beginning of the line in the email body.
To upstream this report, please reply with:
#syz upstream
syzbot hit the following crash on upstream commit
c2a9838452a4d71f76103c18c926468a9ea05713 (Fri Mar 30 05:27:12 2018 +0000)
Merge tag 'for-4.16/dm-fixes-4' of
git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
syzbot dashboard link:
https://syzkaller.appspot.com/bug?extid=626c255917c3dfd56a06
Unfortunately, I don't have any reproducer for this crash yet.
Raw console output:
https://syzkaller.appspot.com/x/log.txt?id=5866410660069376
Kernel config:
https://syzkaller.appspot.com/x/.config?id=-8440362230543204781
compiler: gcc (GCC) 7.1.1 20170620
user-space arch: i386
CC: [a...@linux.intel.com ak...@linux-foundation.org arya...@virtuozzo.com
ja...@suse.cz jla...@redhat.com linux-...@vger.kernel.org
linu...@kvack.org mgo...@techsingularity.net rgol...@suse.com
vi...@zeniv.linux.org.uk]
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+626c25...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
Buffer I/O error on dev loop0, logical block 6, lost async page write
Buffer I/O error on dev loop0, logical block 7, lost async page write
Buffer I/O error on dev loop0, logical block 8, lost async page write
Buffer I/O error on dev loop0, logical block 9, lost async page write
random: crng init done
INFO: task syz-executor3:23174 blocked for more than 120 seconds.
Not tainted 4.16.0-rc7+ #281
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3 D20032 23174 13872 0x20020004
Call Trace:
context_switch kernel/sched/core.c:2862 [inline]
__schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440
schedule+0xf5/0x430 kernel/sched/core.c:3499
io_schedule+0x1c/0x70 kernel/sched/core.c:5115
wait_on_page_bit_common+0x4b3/0x770 mm/filemap.c:1099
wait_on_page_bit mm/filemap.c:1132 [inline]
wait_on_page_writeback include/linux/pagemap.h:546 [inline]
__filemap_fdatawait_range+0x282/0x430 mm/filemap.c:533
filemap_fdatawait_range mm/filemap.c:558 [inline]
filemap_write_and_wait_range+0x74/0xc0 mm/filemap.c:659
generic_file_read_iter+0x409/0x28e0 mm/filemap.c:2334
blkdev_read_iter+0x105/0x170 fs/block_dev.c:1928
call_read_iter include/linux/fs.h:1776 [inline]
generic_file_splice_read+0x3f9/0x7b0 fs/splice.c:307
do_splice_to+0x10a/0x160 fs/splice.c:880
splice_direct_to_actor+0x242/0x820 fs/splice.c:952
do_splice_direct+0x29b/0x3c0 fs/splice.c:1061
do_sendfile+0x5c9/0xe80 fs/read_write.c:1413
C_SYSC_sendfile fs/read_write.c:1489 [inline]
compat_SyS_sendfile+0xea/0x1a0 fs/read_write.c:1478
do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
do_fast_syscall_32+0x3ec/0xf9f arch/x86/entry/common.c:392
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f46c99
RSP: 002b:00000000f769d09c EFLAGS: 00000286 ORIG_RAX: 00000000000000bb
RAX: ffffffffffffffda RBX: 0000000000000013 RCX: 0000000000000013
RDX: 0000000020000080 RSI: 0000000002000004 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
3 locks held by kworker/u4:0/5:
#0: ((wq_completion)"writeback"){+.+.}, at: [<00000000d67eb335>]
work_static include/linux/workqueue.h:198 [inline]
#0: ((wq_completion)"writeback"){+.+.}, at: [<00000000d67eb335>]
set_work_data kernel/workqueue.c:619 [inline]
#0: ((wq_completion)"writeback"){+.+.}, at: [<00000000d67eb335>]
set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ((wq_completion)"writeback"){+.+.}, at: [<00000000d67eb335>]
process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084
#1: ((work_completion)(&(&wb->dwork)->work)){+.+.}, at:
[<0000000025b154ed>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088
#2: (&type->s_umount_key#33){++++}, at: [<00000000acd1e72d>]
trylock_super+0x20/0x100 fs/super.c:395
2 locks held by khungtaskd/868:
#0: (rcu_read_lock){....}, at: [<00000000224e260f>]
check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000224e260f>] watchdog+0x1c5/0xd60
kernel/hung_task.c:249
#1: (tasklist_lock){.+.?}, at: [<00000000c0944745>]
debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
2 locks held by getty/4414:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4415:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4416:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4417:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4418:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4419:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4420:
#0: (&tty->ldisc_sem){++++}, at: [<0000000058ce2b1b>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000b27ebcc9>]
n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
1 lock held by syz-executor1/23158:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000010e661b>]
iterate_bdevs+0xc8/0x260 fs/block_dev.c:2160
1 lock held by syz-executor5/23184:
#0: (&bdev->bd_mutex){+.+.}, at: [<00000000ea362300>]
__blkdev_get+0x176/0x13b0 fs/block_dev.c:1458
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 868 Comm: khungtaskd Not tainted 4.16.0-rc7+ #281
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+0x194/0x24d lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x123/0x180 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.16.0-rc7+ #281
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:76 [inline]
RIP: 0010:rcu_read_lock_sched_notrace include/linux/rcupdate.h:754 [inline]
RIP: 0010:trace_softirq_raise include/trace/events/irq.h:156 [inline]
RIP: 0010:__raise_softirq_irqoff kernel/softirq.c:443 [inline]
RIP: 0010:raise_softirq_irqoff+0x220/0x320 kernel/softirq.c:417
RSP: 0018:ffff8801db207c90 EFLAGS: 00000083
RAX: 0000000000000000 RBX: 1ffff1003b640f93 RCX: dffffc0000000000
RDX: 1ffff1003b645a0a RSI: 1ffff1003b640fc5 RDI: 0000000000000007
RBP: ffff8801db207d60 R08: 1ffff1003b6459fd R09: ffff88021fff8008
R10: ffff88021fff8010 R11: ffff88021fff801d R12: 0000000000000007
R13: ffff8801db207d38 R14: ffff8801db207e68 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 0000000007a22001 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
scheduler_ipi+0x50b/0x820 kernel/sched/core.c:1802
smp_reschedule_interrupt+0xe6/0x650 arch/x86/kernel/smp.c:277
reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:881
</IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffffffff87a07c38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
RAX: dffffc0000000000 RBX: 1ffffffff0f40f8a RCX: 0000000000000000
RDX: 1ffffffff0f59580 RSI: 0000000000000001 RDI: ffffffff87acac00
RBP: ffffffff87a07c38 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff87a07cf0 R14: ffffffff883b4820 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0xbf/0x430 arch/x86/kernel/process.c:354
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:345
default_idle_call+0x36/0x90 kernel/sched/idle.c:98
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x24a/0x3b0 kernel/sched/idle.c:246
cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:351
rest_init+0xed/0xf0 init/main.c:437
start_kernel+0x7f1/0x819 init/main.c:717
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:239
Code: 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 d4 00 00 00 4d 8b 3e 4d 85 ff 75
b6 65 ff 0d cc 38 be 7e e9 62 fe ff ff 65 ff 05 c0 38 be 7e <49> 8d 45 c0
48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 48 01 d0
---
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syzbot
Feb 22, 2019, 5:22:15 AM2/22/19
to syzkaller-upst...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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