syzbot


BUG: spinlock bad magic in remove_wait_queue

Status: auto-closed as invalid on 2019/02/22 14:56
First crash: 2249d, last: 2214d

Sample crash report:
kasan: CONFIG_KASAN_INLINE enabled
BUG: spinlock bad magic on CPU#1, syz-executor2/6350
 lock: 0xffff8801b3d5c218, .magic: dead4eac, .owner: <none>/-1, .owner_cpu: -1
CPU: 1 PID: 6350 Comm: syz-executor2 Not tainted 4.9.88-g71df7bb #60
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d3dff860 ffffffff81d95f19 ffff8801b3d5c218 ffff8801d436c800
 ffffed0038b406c8 ffffffff844de4a0 ffff8801c5a03640 ffff8801d3dff8a0
 ffffffff81248e8d ffffffff812249f4 65adac9e00000000 0000000000000000
Call Trace:
 [<ffffffff81d95f19>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95f19>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81248e8d>] spin_dump+0x14d/0x280 kernel/locking/spinlock_debug.c:67
 [<ffffffff812491c4>] spin_bug kernel/locking/spinlock_debug.c:75 [inline]
 [<ffffffff812491c4>] debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
 [<ffffffff812491c4>] do_raw_spin_lock+0x174/0x1e0 kernel/locking/spinlock_debug.c:112
 [<ffffffff838b78a6>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 [<ffffffff838b78a6>] _raw_spin_lock_irqsave+0x56/0x70 kernel/locking/spinlock.c:159
 [<ffffffff812249f4>] remove_wait_queue+0x14/0x40 kernel/sched/wait.c:49
 [<ffffffff81651e2f>] ep_remove_wait_queue fs/eventpoll.c:535 [inline]
 [<ffffffff81651e2f>] ep_unregister_pollwait.isra.6+0xaf/0x240 fs/eventpoll.c:553
 [<ffffffff81652b76>] ep_free+0x96/0x1b0 fs/eventpoll.c:770
 [<ffffffff81652cd4>] ep_eventpoll_release+0x44/0x60 fs/eventpoll.c:802
 [<ffffffff81575f6c>] __fput+0x28c/0x6e0 fs/file_table.c:208
 [<ffffffff81576445>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81195f05>] task_work_run+0x115/0x190 kernel/task_work.c:116
 [<ffffffff8113c8b7>] exit_task_work include/linux/task_work.h:21 [inline]
 [<ffffffff8113c8b7>] do_exit+0x7e7/0x2a40 kernel/exit.c:833
 [<ffffffff81142fc8>] do_group_exit+0x108/0x320 kernel/exit.c:937
 [<ffffffff81165e44>] get_signal+0x4d4/0x14e0 kernel/signal.c:2317
 [<ffffffff81052c87>] do_signal+0x87/0x19f0 arch/x86/kernel/signal.c:807
 [<ffffffff81004ff1>] 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
 [<ffffffff838b7a53>] 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: 0 PID: 6347 Comm: syz-executor0 Not tainted 4.9.88-g71df7bb #60
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d7470000 task.stack: ffff8801b3d48000
RIP: 0010:[<ffffffff8144f3b1>]  [<ffffffff8144f3b1>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8144f3b1>]  [<ffffffff8144f3b1>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP: 0010:[<ffffffff8144f3b1>]  [<ffffffff8144f3b1>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP: 0010:[<ffffffff8144f3b1>]  [<ffffffff8144f3b1>] put_page_testzero include/linux/mm.h:450 [inline]
RIP: 0010:[<ffffffff8144f3b1>]  [<ffffffff8144f3b1>] __free_pages+0x21/0x80 mm/page_alloc.c:3897
RSP: 0018:ffff8801b3d4fa60  EFLAGS: 00010a07
RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82669b0b
RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c
RBP: ffff8801b3d4fa70 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801d7470000 R12: 0000000000000004
R13: 0000000000000020 R14: ffff8801d413c200 R15: dffffc0000000000
FS:  00007f01585b2700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000072c000 CR3: 00000001c2054000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffff8801d413c358 ffff8801b3d4fad0 ffffffff82669b31
 ffff8801d413c370 ffffed003a82786b ffffed003a82786e ffff8801d413c368
 dead4ead00000000 ffff8801d413c340 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff82669b31>] sg_remove_scat.isra.19+0x1c1/0x2d0 drivers/scsi/sg.c:1944
 [<ffffffff82669ef5>] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1825
 [<ffffffff8266a2d6>] sg_new_read.isra.20+0x356/0x3e0 drivers/scsi/sg.c:566
 [<ffffffff8266bc27>] sg_read+0x8b7/0x1440 drivers/scsi/sg.c:455
 [<ffffffff8156c7d3>] __vfs_read+0x103/0x670 fs/read_write.c:449
 [<ffffffff815706ee>] vfs_read+0x11e/0x380 fs/read_write.c:472
 [<ffffffff815743e9>] SYSC_read fs/read_write.c:588 [inline]
 [<ffffffff815743e9>] SyS_read+0xd9/0x1b0 fs/read_write.c:581
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b7a53>] 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  [<ffffffff8144f3b1>] __read_once_size include/linux/compiler.h:243 [inline]
RIP  [<ffffffff8144f3b1>] atomic_read arch/x86/include/asm/atomic.h:26 [inline]
RIP  [<ffffffff8144f3b1>] page_ref_count include/linux/page_ref.h:66 [inline]
RIP  [<ffffffff8144f3b1>] put_page_testzero include/linux/mm.h:450 [inline]
RIP  [<ffffffff8144f3b1>] __free_pages+0x21/0x80 mm/page_alloc.c:3897
 RSP <ffff8801b3d4fa60>
---[ end trace f149a9ee4c1dc1a7 ]---

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/03/22 05:24 https://android.googlesource.com/kernel/common android-4.9 71df7bbae4d8 95c88d7a .config console log report ci-android-49-kasan-gce
2018/03/19 15:54 https://android.googlesource.com/kernel/common android-4.9 bb52bba67e35 7e7d7ed2 .config console log report ci-android-49-kasan-gce
2018/03/13 20:33 https://android.googlesource.com/kernel/common android-4.9 97d7f1c7c0f0 08dacaa0 .config console log report ci-android-49-kasan-gce
2018/03/07 04:19 https://android.googlesource.com/kernel/common android-4.9 b324a701539e c8a18476 .config console log report ci-android-49-kasan-gce
2018/02/18 03:39 https://android.googlesource.com/kernel/common android-4.9 cdfc8df1d262 833f78c7 .config console log report ci-android-49-kasan-gce
2018/02/15 03:57 https://android.googlesource.com/kernel/common android-4.9 d2c57b60569e 17061fc0 .config console log report ci-android-49-kasan-gce
2018/03/04 04:52 https://android.googlesource.com/kernel/common android-4.9 e0b05e693a9d 2c6f473e .config console log report ci-android-49-kasan-gce-386
* Struck through repros no longer work on HEAD.