kasan: CONFIG_KASAN_INLINE enabled[   45.638278] BUG: spinlock bad magic on CPU#0, syz-executor6/6763
 lock: 0xffff8800b7938018, .magic: dead4eac, .owner: <none>/-1, .owner_cpu: -1
CPU: 0 PID: 6763 Comm: syz-executor6 Not tainted 4.4.114-ga81d322 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 4f05fc83f91e8dac ffff8800ba46f850 ffffffff81d0394d
 ffff8800b7938018 ffff8801d6169800 ffff8800addea640 ffff8800addea600
 dffffc0000000000 ffff8800ba46f890 ffffffff81246a9d ffff880100000000
Call Trace:
 [<ffffffff81d0394d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0394d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff81246a9d>] spin_dump+0x14d/0x280 kernel/locking/spinlock_debug.c:67
 [<ffffffff81246e88>] spin_bug kernel/locking/spinlock_debug.c:75 [inline]
 [<ffffffff81246e88>] debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
 [<ffffffff81246e88>] do_raw_spin_lock+0x228/0x2c0 kernel/locking/spinlock_debug.c:135
 [<ffffffff83773ad6>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 [<ffffffff83773ad6>] _raw_spin_lock_irqsave+0x56/0x70 kernel/locking/spinlock.c:159
 [<ffffffff812200e4>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff815f6988>] ep_remove_wait_queue fs/eventpoll.c:530 [inline]
 [<ffffffff815f6988>] ep_unregister_pollwait.isra.6+0xa8/0x220 fs/eventpoll.c:548
 [<ffffffff815f76b3>] ep_free+0x93/0x1c0 fs/eventpoll.c:765
 [<ffffffff815f7824>] ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:797
 [<ffffffff815234e3>] __fput+0x233/0x6d0 fs/file_table.c:208
 [<ffffffff81523a05>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff8118b9d4>] task_work_run+0x104/0x180 kernel/task_work.c:115
 [<ffffffff81132f7a>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff81132f7a>] do_exit+0x82a/0x2a10 kernel/exit.c:755
 [<ffffffff81139418>] do_group_exit+0x108/0x320 kernel/exit.c:885
 [<ffffffff8115c872>] get_signal+0x4f2/0x1550 kernel/signal.c:2317
 [<ffffffff8100e7fb>] do_signal+0x8b/0x1d40 arch/x86/kernel/signal.c:712
 [<ffffffff810035fa>] exit_to_usermode_loop+0x11a/0x160 arch/x86/entry/common.c:247
 [<ffffffff81007067>] prepare_exit_to_usermode arch/x86/entry/common.c:282 [inline]
 [<ffffffff81007067>] syscall_return_slowpath arch/x86/entry/common.c:347 [inline]
 [<ffffffff81007067>] do_syscall_32_irqs_on arch/x86/entry/common.c:396 [inline]
 [<ffffffff81007067>] do_fast_syscall_32+0x607/0x890 arch/x86/entry/common.c:457
 [<ffffffff8377586a>] sysenter_flags_fixed+0xd/0x17
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 6761 Comm: syz-executor0 Not tainted 4.4.114-ga81d322 #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d66f6000 task.stack: ffff8801d6570000
RIP: 0010:[<ffffffff81434891>]  [<ffffffff81434891>] __read_once_size include/linux/compiler.h:218 [inline]
RIP: 0010:[<ffffffff81434891>]  [<ffffffff81434891>] atomic_read arch/x86/include/asm/atomic.h:27 [inline]
RIP: 0010:[<ffffffff81434891>]  [<ffffffff81434891>] put_page_testzero include/linux/mm.h:357 [inline]
RIP: 0010:[<ffffffff81434891>]  [<ffffffff81434891>] __free_pages+0x21/0x90 mm/page_alloc.c:3365
RSP: 0018:ffff8801d65779c0  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b823b
RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c
RBP: ffff8801d65779d0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff1003acaef16 R12: 0000000000000004
R13: 0000000000000020 R14: ffff8800b793a100 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f6f38b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000008113bb8 CR3: 00000001da1b0000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000246 ffff8800b793a258 ffff8801d6577a30 ffffffff825b8261
 ffff8800b793a270 ffffed0016f2744b ffffed0016f2744e ffff8800b793a268
 dead4ead00000000 ffff8800b793a240 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff825b8261>] sg_remove_scat.isra.17+0x1c1/0x2d0 drivers/scsi/sg.c:1954
 [<ffffffff825b8625>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1835
 [<ffffffff825ba4ab>] sg_read+0xa1b/0x1490 drivers/scsi/sg.c:537
 [<ffffffff8151d6e1>] do_loop_readv_writev+0x141/0x1e0 fs/read_write.c:680
 [<ffffffff8152027f>] compat_do_readv_writev+0x5df/0x6e0 fs/read_write.c:984
 [<ffffffff81520459>] compat_readv+0xd9/0x140 fs/read_write.c:1013
 [<ffffffff815227c8>] C_SYSC_readv fs/read_write.c:1033 [inline]
 [<ffffffff815227c8>] compat_SyS_readv+0xd8/0x1b0 fs/read_write.c:1022
 [<ffffffff81006d74>] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline]
 [<ffffffff81006d74>] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457
 [<ffffffff8377586a>] sysenter_flags_fixed+0xd/0x17
Code: c6 9f 0c 00 e9 78 fd ff ff 90 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 49 
RIP  [<ffffffff81434891>] __read_once_size include/linux/compiler.h:218 [inline]
RIP  [<ffffffff81434891>] atomic_read arch/x86/include/asm/atomic.h:27 [inline]
RIP  [<ffffffff81434891>] put_page_testzero include/linux/mm.h:357 [inline]
RIP  [<ffffffff81434891>] __free_pages+0x21/0x90 mm/page_alloc.c:3365
 RSP <ffff8801d65779c0>
---[ end trace d62f4ebdfd322ff7 ]---