kasan: CONFIG_KASAN_INLINE enabled
BUG: spinlock bad magic on CPU#0, syz-executor0/8172
 lock: 0xffff8801cd4d8018, .magic: dead4eac, .owner: <none>/-1, .owner_cpu: -1
CPU: 0 PID: 8172 Comm: syz-executor0 Not tainted 4.9.85-ge0b05e6 #57
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cb2f7830 ffffffff81d95739 ffff8801cd4d8018 ffff8801cb851800
 ffffed00378f56c8 ffffffff844de160 ffff8801bc7ab640 ffff8801cb2f7870
 ffffffff81248aad ffffffff81224614 1577c54c00000000 0000000000000000
Call Trace:
 [<ffffffff81d95739>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95739>] 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
 [<ffffffff838b5266>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 [<ffffffff838b5266>] _raw_spin_lock_irqsave+0x56/0x70 kernel/locking/spinlock.c:159
 [<ffffffff81224614>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff816516cf>] ep_remove_wait_queue fs/eventpoll.c:535 [inline]
 [<ffffffff816516cf>] ep_unregister_pollwait.isra.6+0xaf/0x240 fs/eventpoll.c:553
 [<ffffffff81652131>] ep_remove+0x41/0x290 fs/eventpoll.c:716
 [<ffffffff816540d5>] eventpoll_release_file+0xc5/0x140 fs/eventpoll.c:940
 [<ffffffff81575b38>] eventpoll_release include/linux/eventpoll.h:61 [inline]
 [<ffffffff81575b38>] __fput+0x5a8/0x6e0 fs/file_table.c:199
 [<ffffffff81575cf5>] ____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
 [<ffffffff81007261>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff81007261>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff81007261>] do_syscall_32_irqs_on arch/x86/entry/common.c:331 [inline]
 [<ffffffff81007261>] do_fast_syscall_32+0x5c1/0x870 arch/x86/entry/common.c:387
 [<ffffffff838b6b10>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
kasan: CONFIG_KASAN_INLINE enabled
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: 0 PID: 8190 Comm: syz-executor4 Not tainted 4.9.85-ge0b05e6 #57
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801ca560000 task.stack: ffff8801d9358000
RIP: 0010:[<ffffffff8144eec1>]  [<ffffffff8144eec1>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8144eec1>]  [<ffffffff8144eec1>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:[<ffffffff8144eec1>]  [<ffffffff8144eec1>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP: 0010:[<ffffffff8144eec1>]  [<ffffffff8144eec1>] put_page_testzero include/linux/mm.h:450 [inline]
RIP: 0010:[<ffffffff8144eec1>]  [<ffffffff8144eec1>] __free_pages+0x21/0x80 mm/page_alloc.c:3897
RSP: 0018:ffff8801d935f930  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82668efb
RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c
RBP: ffff8801d935f940 R08: 0000000048000000 R09: 0000000000001e30
R10: 0000000000002100 R11: ffff8801ca560000 R12: 0000000000000004
R13: 0000000000000020 R14: ffff8801cd4dc200 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f6efcb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f6efcdb0 CR3: 00000001ca6c4000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffff8801cd4dc358 ffff8801d935f9a0 ffffffff82668f21
 ffff8801cd4dc370 ffffed0039a9b86b ffffed0039a9b86e ffff8801cd4dc368
 dead4ead00000000 ffff8801cd4dc340 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff82668f21>] sg_remove_scat.isra.19+0x1c1/0x2d0 drivers/scsi/sg.c:1944
 [<ffffffff826692e5>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1825
 [<ffffffff826694fd>] sg_new_read.isra.20+0x18d/0x3e0 drivers/scsi/sg.c:566
 [<ffffffff8266b017>] sg_read+0x8b7/0x1440 drivers/scsi/sg.c:455
 [<ffffffff8156cbe8>] do_loop_readv_writev.part.17+0xc8/0x2b0 fs/read_write.c:715
 [<ffffffff81571dcf>] do_loop_readv_writev fs/read_write.c:1097 [inline]
 [<ffffffff81571dcf>] compat_do_readv_writev+0x5ff/0x740 fs/read_write.c:1091
 [<ffffffff81571ff3>] compat_readv+0xe3/0x150 fs/read_write.c:1120
 [<ffffffff81572154>] do_compat_readv+0xf4/0x1d0 fs/read_write.c:1140
 [<ffffffff815746c6>] C_SYSC_readv fs/read_write.c:1152 [inline]
 [<ffffffff815746c6>] compat_SyS_readv+0x26/0x30 fs/read_write.c:1148
 [<ffffffff81006f95>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006f95>] do_fast_syscall_32+0x2f5/0x870 arch/x86/entry/common.c:387
 [<ffffffff838b6b10>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
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  [<ffffffff8144eec1>] __read_once_size include/linux/compiler.h:243 [inline]
RIP  [<ffffffff8144eec1>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP  [<ffffffff8144eec1>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP  [<ffffffff8144eec1>] put_page_testzero include/linux/mm.h:450 [inline]
RIP  [<ffffffff8144eec1>] __free_pages+0x21/0x80 mm/page_alloc.c:3897
 RSP <ffff8801d935f930>
---[ end trace e1cd294bb4e4b3f5 ]---