[<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
BUG: spinlock bad magic on CPU#0, syz-executor7/17341
 lock: 0xffff8801d07fa118, .magic: dead4eac, .owner: <none>/-1, .owner_cpu: -1
CPU: 0 PID: 17341 Comm: syz-executor7 Not tainted 4.9.76-g8dec074 #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c7fff8a8 ffffffff81d93169 ffff8801d07fa118 ffff8801c0d73000
 dffffc0000000000 ffff8801c7fffbe0 ffff8801c7fffc10 ffff8801c7fff8e8
 ffffffff812477cd ffffffff81223334 ffff880100000000 0000000000000000
Call Trace:
 [<ffffffff81d93169>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d93169>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff812477cd>] spin_dump+0x14d/0x280 kernel/locking/spinlock_debug.c:67
 [<ffffffff81247b04>] spin_bug kernel/locking/spinlock_debug.c:75 [inline]
 [<ffffffff81247b04>] debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
 [<ffffffff81247b04>] do_raw_spin_lock+0x174/0x1e0 kernel/locking/spinlock_debug.c:112
 [<ffffffff838b08d6>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 [<ffffffff838b08d6>] _raw_spin_lock_irqsave+0x56/0x70 kernel/locking/spinlock.c:159
 [<ffffffff81223334>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff815afa82>] free_poll_entry fs/select.c:133 [inline]
 [<ffffffff815afa82>] poll_freewait+0xd2/0x250 fs/select.c:142
 [<ffffffff815b3027>] do_sys_poll+0x617/0xcb0 fs/select.c:926
 [<ffffffff815b39f0>] SYSC_poll fs/select.c:983 [inline]
 [<ffffffff815b39f0>] SyS_poll+0x120/0x3f0 fs/select.c:971
 [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 17351 Comm: syz-executor7 Not tainted 4.9.76-g8dec074 #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c2fbb000 task.stack: ffff8801c25b8000
RIP: 0010:[<ffffffff8144dcb1>]  [<ffffffff8144dcb1>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8144dcb1>]  [<ffffffff8144dcb1>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:[<ffffffff8144dcb1>]  [<ffffffff8144dcb1>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP: 0010:[<ffffffff8144dcb1>]  [<ffffffff8144dcb1>] put_page_testzero include/linux/mm.h:450 [inline]
RIP: 0010:[<ffffffff8144dcb1>]  [<ffffffff8144dcb1>] __free_pages+0x21/0x80 mm/page_alloc.c:3903
RSP: 0018:ffff8801c25bfa00  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266642b
RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c
RBP: ffff8801c25bfa10 R08: 0000000000000000 R09: ffffed0038501811
R10: 0000000000000005 R11: ffffed0038501810 R12: 0000000000000004
R13: 0000000000000020 R14: ffff8801c348c200 R15: dffffc0000000000
FS:  00007f2f04325700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020639000 CR3: 00000001c51f6000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff838b15a9 ffff8801c348c358 ffff8801c25bfa70 ffffffff82666451
 ffff8801c348c370 ffffed003869186b ffffed003869186e ffff8801c348c368
 dead4ead00000000 ffff8801c348c340 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff82666451>] sg_remove_scat.isra.19+0x1c1/0x2d0 drivers/scsi/sg.c:1954
 [<ffffffff82666815>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1836
 [<ffffffff8266862c>] sg_read+0xa1c/0x1440 drivers/scsi/sg.c:527
 [<ffffffff8156b571>] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714
 [<ffffffff8156f3e0>] do_loop_readv_writev fs/read_write.c:880 [inline]
 [<ffffffff8156f3e0>] do_readv_writev+0x520/0x750 fs/read_write.c:874
 [<ffffffff8156f694>] vfs_readv+0x84/0xc0 fs/read_write.c:898
 [<ffffffff8156f7b6>] do_readv+0xe6/0x250 fs/read_write.c:924
 [<ffffffff81572ca7>] SYSC_readv fs/read_write.c:1011 [inline]
 [<ffffffff81572ca7>] SyS_readv+0x27/0x30 fs/read_write.c:1008
 [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
Code: e9 27 fc ff ff 0f 1f 44 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  [<ffffffff8144dcb1>] __read_once_size include/linux/compiler.h:243 [inline]
RIP  [<ffffffff8144dcb1>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP  [<ffffffff8144dcb1>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP  [<ffffffff8144dcb1>] put_page_testzero include/linux/mm.h:450 [inline]
RIP  [<ffffffff8144dcb1>] __free_pages+0x21/0x80 mm/page_alloc.c:3903
 RSP <ffff8801c25bfa00>
---[ end trace 4ea564ad4d7b488f ]---