kasan: CONFIG_KASAN_INLINE enabled
BUG: spinlock bad magic on CPU#1, syz-executor0/4697
 lock: 0xffff8801be174218, .magic: dead4eac, .owner: <none>/-1, .owner_cpu: -1
CPU: 1 PID: 4697 Comm: syz-executor0 Not tainted 4.9.78-gf518fe4 #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801cf037c08 ffffffff81d943a9 ffff8801be174218 ffff8801cf0f6000
 ffff8801c5b1bdbc ffff8801be174218 ffff8801c5b16b10 ffff8801cf037c48
 ffffffff8124889d ffffffff81223eef ffff880100000000 0000000000000000
Call Trace:
 [<ffffffff81d943a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d943a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8124889d>] spin_dump+0x14d/0x280 kernel/locking/spinlock_debug.c:67
 [<ffffffff81248bd4>] spin_bug kernel/locking/spinlock_debug.c:75 [inline]
 [<ffffffff81248bd4>] debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
 [<ffffffff81248bd4>] do_raw_spin_lock+0x174/0x1e0 kernel/locking/spinlock_debug.c:112
 [<ffffffff838b2a96>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 [<ffffffff838b2a96>] _raw_spin_lock_irqsave+0x56/0x70 kernel/locking/spinlock.c:159
 [<ffffffff81223eef>] add_wait_queue+0x3f/0xa0 kernel/sched/wait.c:28
 [<ffffffff8164f81d>] ep_ptable_queue_proc+0x1bd/0x2b0 fs/eventpoll.c:1138
 [<ffffffff82665aeb>] poll_wait include/linux/poll.h:45 [inline]
 [<ffffffff82665aeb>] sg_poll+0xcb/0x340 drivers/scsi/sg.c:1159
 [<ffffffff81654c37>] ep_item_poll fs/eventpoll.c:811 [inline]
 [<ffffffff81654c37>] ep_insert fs/eventpoll.c:1347 [inline]
 [<ffffffff81654c37>] SYSC_epoll_ctl fs/eventpoll.c:1975 [inline]
 [<ffffffff81654c37>] SyS_epoll_ctl+0x11d7/0x2190 fs/eventpoll.c:1861
 [<ffffffff838b2c6e>] entry_SYSCALL_64_fastpath+0x29/0xe8
mmap: syz-executor1 (4717) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.txt.
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: 4687 Comm: syz-executor3 Not tainted 4.9.78-gf518fe4 #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cf5eb000 task.stack: ffff8801be0f0000
RIP: 0010:[<ffffffff8144ed91>]  [<ffffffff8144ed91>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8144ed91>]  [<ffffffff8144ed91>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:[<ffffffff8144ed91>]  [<ffffffff8144ed91>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP: 0010:[<ffffffff8144ed91>]  [<ffffffff8144ed91>] put_page_testzero include/linux/mm.h:450 [inline]
RIP: 0010:[<ffffffff8144ed91>]  [<ffffffff8144ed91>] __free_pages+0x21/0x80 mm/page_alloc.c:3903
RSP: 0018:ffff8801be0f7ab0  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff826676fb
RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c
RBP: ffff8801be0f7ac0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004
R13: 0000000000000020 R14: ffff8801cf02c200 R15: dffffc0000000000
FS:  00007f9f9747e700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002907978 CR3: 00000001cf4d6000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801cf5eb000 ffff8801cf02c358 ffff8801be0f7b20 ffffffff82667721
 ffff8801cf02c370 ffffed0039e0586b ffffed0039e0586e ffff8801cf02c368
 dead4ead00000000 ffff8801cf02c340 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff82667721>] sg_remove_scat.isra.19+0x1c1/0x2d0 drivers/scsi/sg.c:1944
 [<ffffffff82667ae5>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1825
 [<ffffffff82667ba9>] sg_new_read.isra.20+0x39/0x3e0 drivers/scsi/sg.c:566
 [<ffffffff82669817>] sg_read+0x8b7/0x1440 drivers/scsi/sg.c:455
 [<ffffffff8156ba73>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156f80e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff81573539>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff81573539>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff838b2c6e>] entry_SYSCALL_64_fastpath+0x29/0xe8
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  [<ffffffff8144ed91>] __read_once_size include/linux/compiler.h:243 [inline]
RIP  [<ffffffff8144ed91>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP  [<ffffffff8144ed91>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP  [<ffffffff8144ed91>] put_page_testzero include/linux/mm.h:450 [inline]
RIP  [<ffffffff8144ed91>] __free_pages+0x21/0x80 mm/page_alloc.c:3903
 RSP <ffff8801be0f7ab0>
---[ end trace c1798303b9989dd0 ]---