syzbot

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WARNING: CPU: 1 PID: 4085 at kernel/locking/lockdep.c:3190 __lock_acquire+0x23b3/0x4b50 kernel/locking/lockdep.c:3190()
DEBUG_LOCKS_WARN_ON(id >= MAX_LOCKDEP_KEYS)
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4085 Comm: syzkaller160734 Not tainted 4.4.107-g79f138a #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 fac66347bd2b1d29 ffff8800b6a470c0 ffffffff81d03a1d
 ffffffff838429a0 ffff8800b6a47198 ffffffff83854820 0000000000000009
 0000000000000c76 ffff8800b6a47188 ffffffff81416dca 0000000041b58ab3
Call Trace:
 [<ffffffff81d03a1d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d03a1d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81416dca>] panic+0x1aa/0x388 kernel/panic.c:112
 [<ffffffff8112ad95>] warn_slowpath_common+0x125/0x140 kernel/panic.c:455
 [<ffffffff8112ae71>] warn_slowpath_fmt+0xc1/0x110 kernel/panic.c:471
 [<ffffffff812361f3>] __lock_acquire+0x23b3/0x4b50 kernel/locking/lockdep.c:3190
 [<ffffffff8123a1fe>] lock_acquire+0x15e/0x460 kernel/locking/lockdep.c:3592
 [<ffffffff8376f89e>] __raw_write_lock_irqsave include/linux/rwlock_api_smp.h:186 [inline]
 [<ffffffff8376f89e>] _raw_write_lock_irqsave+0x4e/0x70 kernel/locking/spinlock.c:303
 [<ffffffff825b46c9>] sg_remove_request+0x69/0x110 drivers/scsi/sg.c:2132
 [<ffffffff825b4cd5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1848
 [<ffffffff825b6b11>] sg_read+0xa21/0x1490 drivers/scsi/sg.c:538
 [<ffffffff810002b8>] ? 0xffffffff810002b8
 [<ffffffff8151a8e1>] do_loop_readv_writev+0x141/0x1e0 fs/read_write.c:680
 [<ffffffff8151cc3d>] do_readv_writev+0x5dd/0x6e0 fs/read_write.c:810
 [<ffffffff8151cdb8>] vfs_readv+0x78/0xb0 fs/read_write.c:834
 [<ffffffff815b863a>] kernel_readv fs/splice.c:586 [inline]
 [<ffffffff815b863a>] default_file_splice_read+0x4fa/0x8e0 fs/splice.c:662
 [<ffffffff815b4365>] do_splice_to+0xf5/0x140 fs/splice.c:1154
 [<ffffffff815ba599>] do_splice fs/splice.c:1427 [inline]
 [<ffffffff815ba599>] SYSC_splice fs/splice.c:1707 [inline]
 [<ffffffff815ba599>] SyS_splice+0x1009/0x14b0 fs/splice.c:1690
 [<ffffffff81006d84>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d84>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff83771357>] sysenter_flags_fixed+0xd/0x17
BUG: KASAN: out-of-bounds in list_empty include/linux/list.h:189 [inline]
BUG: KASAN: out-of-bounds in sg_remove_request+0xf9/0x110 drivers/scsi/sg.c:2130
Read of size 8 at addr ffff8801d5993740 by task syzkaller160734/4073

CPU: 0 PID: 4073 Comm: syzkaller160734 Not tainted 4.4.107-g79f138a #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 847e5af13f711d75 ffff8801ccf27480 ffffffff81d03a1d
 ffffea00075664c0 ffff8801d5993740 0000000000000000 ffff8801d5993748
 ffff8800b57a4438 ffff8801ccf274b8 ffffffff814fb0c3 ffff8801d5993740
Call Trace:
 [<ffffffff81d03a1d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d03a1d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fb0c3>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fb5d5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fb5d5>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fb734>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff825b4759>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff825b4759>] sg_remove_request+0xf9/0x110 drivers/scsi/sg.c:2130
 [<ffffffff825b4cd5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1848
 [<ffffffff825b6b11>] sg_read+0xa21/0x1490 drivers/scsi/sg.c:538
 [<ffffffff810002b8>] ? 0xffffffff810002b8
 [<ffffffff8151a8e1>] do_loop_readv_writev+0x141/0x1e0 fs/read_write.c:680
 [<ffffffff8151cc3d>] do_readv_writev+0x5dd/0x6e0 fs/read_write.c:810
 [<ffffffff8151cdb8>] vfs_readv+0x78/0xb0 fs/read_write.c:834
 [<ffffffff815b863a>] kernel_readv fs/splice.c:586 [inline]
 [<ffffffff815b863a>] default_file_splice_read+0x4fa/0x8e0 fs/splice.c:662
 [<ffffffff815b4365>] do_splice_to+0xf5/0x140 fs/splice.c:1154
 [<ffffffff815ba599>] do_splice fs/splice.c:1427 [inline]
 [<ffffffff815ba599>] SYSC_splice fs/splice.c:1707 [inline]
 [<ffffffff815ba599>] SyS_splice+0x1009/0x14b0 fs/splice.c:1690
 [<ffffffff81006d84>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d84>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff83771357>] sysenter_flags_fixed+0xd/0x17

Allocated by task 4082:
 [<ffffffff81035c86>] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63
 [<ffffffff814fa133>] save_stack+0x43/0xd0 mm/kasan/kasan.c:512
 [<ffffffff814fa3fd>] set_track mm/kasan/kasan.c:524 [inline]
 [<ffffffff814fa3fd>] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616
 [<ffffffff814fa9d2>] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554
 [<ffffffff814f60da>] slab_post_alloc_hook mm/slub.c:1349 [inline]
 [<ffffffff814f60da>] slab_alloc_node mm/slub.c:2615 [inline]
 [<ffffffff814f60da>] slab_alloc mm/slub.c:2623 [inline]
 [<ffffffff814f60da>] kmem_cache_alloc+0xba/0x290 mm/slub.c:2628
 [<ffffffff81556aa7>] fasync_alloc fs/fcntl.c:603 [inline]
 [<ffffffff81556aa7>] fasync_add_entry fs/fcntl.c:661 [inline]
 [<ffffffff81556aa7>] fasync_helper+0x37/0xb0 fs/fcntl.c:690
 [<ffffffff825b33e6>] sg_fasync+0x86/0xb0 drivers/scsi/sg.c:1213
 [<ffffffff81558121>] ioctl_fioasync fs/ioctl.c:511 [inline]
 [<ffffffff81558121>] do_vfs_ioctl+0x981/0xee0 fs/ioctl.c:576
 [<ffffffff8161cf1e>] C_SYSC_ioctl fs/compat_ioctl.c:1614 [inline]
 [<ffffffff8161cf1e>] compat_SyS_ioctl+0x64e/0x2540 fs/compat_ioctl.c:1544
 [<ffffffff81006d84>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d84>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff83771357>] sysenter_flags_fixed+0xd/0x17

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801d5993700
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801d5993700, ffff8801d5993760)
The buggy address belongs to the page:
Shutting down cpus with NMI
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..