kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
BUG: spinlock bad magic on CPU#1, syz-executor7/9154
 lock: 0xffff8801cb9da118, .magic: dead4eac, .owner: <none>/-1, .owner_cpu: -1
CPU: 1 PID: 9154 Comm: syz-executor7 Not tainted 4.9.67-gf26d3c7 #106
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c6aa7898 ffffffff81d906e9 ffff8801cb9da118 ffff8801d60cc800
 ffffed003960e6e0 ffffffff844d7e80 ffff8801cb073700 ffff8801c6aa78d8
 ffffffff81245eed ffffffff81221a54 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff81d906e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d906e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81245eed>] spin_dump+0x14d/0x280 kernel/locking/spinlock_debug.c:67
 [<ffffffff81246224>] spin_bug kernel/locking/spinlock_debug.c:75 [inline]
 [<ffffffff81246224>] debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
 [<ffffffff81246224>] do_raw_spin_lock+0x174/0x1e0 kernel/locking/spinlock_debug.c:112
 [<ffffffff838a97f6>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 [<ffffffff838a97f6>] _raw_spin_lock_irqsave+0x56/0x70 kernel/locking/spinlock.c:159
 [<ffffffff81221a54>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff8164d27f>] ep_remove_wait_queue fs/eventpoll.c:535 [inline]
 [<ffffffff8164d27f>] ep_unregister_pollwait.isra.6+0xaf/0x240 fs/eventpoll.c:553
 [<ffffffff8164dfc6>] ep_free+0x96/0x1b0 fs/eventpoll.c:770
 [<ffffffff8164e124>] ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:802
 [<ffffffff8157171c>] __fput+0x28c/0x6e0 fs/file_table.c:208
 [<ffffffff81571bf5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81193645>] task_work_run+0x115/0x190 kernel/task_work.c:116
 [<ffffffff8113a4d7>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff8113a4d7>] do_exit+0x7e7/0x2a40 kernel/exit.c:833
 [<ffffffff81140be8>] do_group_exit+0x108/0x320 kernel/exit.c:937
 [<ffffffff81163a14>] get_signal+0x4d4/0x14e0 kernel/signal.c:2315
 [<ffffffff81052c87>] do_signal+0x87/0x1a00 arch/x86/kernel/signal.c:807
 [<ffffffff81003a31>] exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:156
 [<ffffffff81006340>] prepare_exit_to_usermode arch/x86/entry/common.c:190 [inline]
 [<ffffffff81006340>] syscall_return_slowpath+0x1a0/0x1e0 arch/x86/entry/common.c:259
 [<ffffffff838a9a26>] entry_SYSCALL_64_fastpath+0xc4/0xc6
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 9153 Comm: syz-executor2 Not tainted 4.9.67-gf26d3c7 #106
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801a5429800 task.stack: ffff8801a81f0000
RIP: 0010:[<ffffffff8144bc11>]  [<ffffffff8144bc11>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8144bc11>]  [<ffffffff8144bc11>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:[<ffffffff8144bc11>]  [<ffffffff8144bc11>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP: 0010:[<ffffffff8144bc11>]  [<ffffffff8144bc11>] put_page_testzero include/linux/mm.h:450 [inline]
RIP: 0010:[<ffffffff8144bc11>]  [<ffffffff8144bc11>] __free_pages+0x21/0x80 mm/page_alloc.c:3910
RSP: 0018:ffff8801a81f79b0  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffc90000a1e000
RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c
RBP: ffff8801a81f79c0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801a5429800 R12: 0000000000000004
R13: 0000000000000020 R14: ffff8801a4f38000 R15: dffffc0000000000
FS:  00007f1b80acb700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000014cacd8 CR3: 00000001c448f000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff838aa3b9 ffff8801a4f38158 ffff8801a81f7a20 ffffffff8265f731
 ffff8801a4f38170 ffffed00349e702b ffffed00349e702e ffff8801a4f38168
 dead4ead00000000 ffff8801a4f38140 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff8265f731>] sg_remove_scat.isra.20+0x1c1/0x2d0 drivers/scsi/sg.c:1954
 [<ffffffff8265faf5>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1836
 [<ffffffff8265fed6>] sg_new_read.isra.21+0x356/0x3e0 drivers/scsi/sg.c:567
 [<ffffffff826617ad>] sg_read+0x8bd/0x1440 drivers/scsi/sg.c:456
 [<ffffffff81568cb1>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156cb20>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156cb20>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156cdd4>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8156cef6>] do_readv+0xe6/0x250 fs/read_write.c:924
 [<ffffffff815703e7>] SYSC_readv fs/read_write.c:1011 [inline]
 [<ffffffff815703e7>] SyS_readv+0x27/0x30 fs/read_write.c:1008
 [<ffffffff838a9985>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: ff 66 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d 
RIP  [<ffffffff8144bc11>] __read_once_size include/linux/compiler.h:243 [inline]
RIP  [<ffffffff8144bc11>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP  [<ffffffff8144bc11>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP  [<ffffffff8144bc11>] put_page_testzero include/linux/mm.h:450 [inline]
RIP  [<ffffffff8144bc11>] __free_pages+0x21/0x80 mm/page_alloc.c:3910
 RSP <ffff8801a81f79b0>
---[ end trace c2ef6a9fcaf20469 ]---