kasan: CONFIG_KASAN_INLINE enabled
BUG: spinlock bad magic on CPU#1, syz-executor7/28034
 lock: 0xffff8801d5232118, .magic: dead4eac, .owner: <none>/-1, .owner_cpu: -1
CPU: 1 PID: 28034 Comm: syz-executor7 Not tainted 4.9.86-gb324a70 #50
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d7317840 ffffffff81d956f9 ffff8801d5232118 ffff8801d4e3b000
 ffffed00378b1250 ffffffff844de420 ffff8801bc589280 ffff8801d7317880
 ffffffff81248aad ffffffff81224614 382b504000000000 0000000000000000
Call Trace:
 [<ffffffff81d956f9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d956f9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81248aad>] spin_dump+0x14d/0x280 kernel/locking/spinlock_debug.c:67
 [<ffffffff81248de4>] spin_bug kernel/locking/spinlock_debug.c:75 [inline]
 [<ffffffff81248de4>] debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
 [<ffffffff81248de4>] do_raw_spin_lock+0x174/0x1e0 kernel/locking/spinlock_debug.c:112
 [<ffffffff838b5456>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 [<ffffffff838b5456>] _raw_spin_lock_irqsave+0x56/0x70 kernel/locking/spinlock.c:159
 [<ffffffff81224614>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff8165168f>] ep_remove_wait_queue fs/eventpoll.c:535 [inline]
 [<ffffffff8165168f>] ep_unregister_pollwait.isra.6+0xaf/0x240 fs/eventpoll.c:553
 [<ffffffff816520f1>] ep_remove+0x41/0x290 fs/eventpoll.c:716
 [<ffffffff81654095>] eventpoll_release_file+0xc5/0x140 fs/eventpoll.c:940
 [<ffffffff81575ae8>] eventpoll_release include/linux/eventpoll.h:61 [inline]
 [<ffffffff81575ae8>] __fput+0x5a8/0x6e0 fs/file_table.c:199
 [<ffffffff81575ca5>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81195855>] task_work_run+0x115/0x190 kernel/task_work.c:116
 [<ffffffff8113c2c7>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff8113c2c7>] do_exit+0x7e7/0x2a40 kernel/exit.c:833
 [<ffffffff811429d8>] do_group_exit+0x108/0x320 kernel/exit.c:937
 [<ffffffff81165854>] get_signal+0x4d4/0x14e0 kernel/signal.c:2317
 [<ffffffff81052c87>] do_signal+0x87/0x19f0 arch/x86/kernel/signal.c:807
 [<ffffffff81003a31>] exit_to_usermode_loop+0xe1/0x120 arch/x86/entry/common.c:157
 [<ffffffff810066cf>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff810066cf>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff810066cf>] do_syscall_64+0x36f/0x490 arch/x86/entry/common.c:287
 [<ffffffff838b5613>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 28035 Comm: syz-executor1 Not tainted 4.9.86-gb324a70 #50
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d4e38000 task.stack: ffff8801b4220000
RIP: 0010:[<ffffffff8144ee71>]  [<ffffffff8144ee71>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8144ee71>]  [<ffffffff8144ee71>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:[<ffffffff8144ee71>]  [<ffffffff8144ee71>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP: 0010:[<ffffffff8144ee71>]  [<ffffffff8144ee71>] put_page_testzero include/linux/mm.h:450 [inline]
RIP: 0010:[<ffffffff8144ee71>]  [<ffffffff8144ee71>] __free_pages+0x21/0x80 mm/page_alloc.c:3897
RSP: 0018:ffff8801b4227a60  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668edb
RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c
RBP: ffff8801b4227a70 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801d4e38000 R12: 0000000000000004
R13: 0000000000000020 R14: ffff8801ce2d4200 R15: dffffc0000000000
FS:  00007f5d5fff4700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056356d647aa8 CR3: 00000001bf164000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffff8801ce2d4358 ffff8801b4227ad0 ffffffff82668f01
 ffff8801ce2d4370 ffffed0039c5a86b ffffed0039c5a86e ffff8801ce2d4368
 dead4ead00000000 ffff8801ce2d4340 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff82668f01>] sg_remove_scat.isra.19+0x1c1/0x2d0 drivers/scsi/sg.c:1944
 [<ffffffff826692c5>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1825
 [<ffffffff826696a6>] sg_new_read.isra.20+0x356/0x3e0 drivers/scsi/sg.c:566
 [<ffffffff8266aff7>] sg_read+0x8b7/0x1440 drivers/scsi/sg.c:455
 [<ffffffff8156c033>] __vfs_read+0x103/0x670 fs/read_write.c:449
 [<ffffffff8156ff4e>] vfs_read+0x11e/0x380 fs/read_write.c:472
 [<ffffffff81573c49>] SYSC_read fs/read_write.c:588 [inline]
 [<ffffffff81573c49>] SyS_read+0xd9/0x1b0 fs/read_write.c:581
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b5613>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
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  [<ffffffff8144ee71>] __read_once_size include/linux/compiler.h:243 [inline]
RIP  [<ffffffff8144ee71>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP  [<ffffffff8144ee71>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP  [<ffffffff8144ee71>] put_page_testzero include/linux/mm.h:450 [inline]
RIP  [<ffffffff8144ee71>] __free_pages+0x21/0x80 mm/page_alloc.c:3897
 RSP <ffff8801b4227a60>
---[ end trace 0d463931877777a0 ]---