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TITLE: general protection fault in sysrq_handle_crash
[ 39.546482][ T5855] sysrq: SysRq : Trigger a crash
[ 39.547393][ T5855] kasan: CONFIG_KASAN_INLINE enabled
[ 39.548179][ T5855] kasan: GPF could be caused by NULL-ptr deref or user memory access
[ 39.549363][ T5855] general protection fault: 0000 [#1] PREEMPT SMP KASAN
[ 39.550427][ T5855] CPU: 3 PID: 5855 Comm: bash Not tainted 4.20.0-next-20190102+ #5
[ 39.551583][ T5855] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[ 39.552956][ T5855] RIP: 0010:sysrq_handle_crash+0x5e/0xd0
[ 39.553793][ T5855] Code: db 74 46 e8 34 d9 a5 fd e8 cf 7a 90 fd e8 2a d9 a5 fd 48 c7 c2 c7 27 dc 83 be 01 00 00 00 48 c7 c7 00 3d 9a 89 e8 d2 13 88 fd <a0> 00 00 00 00 00 fc ff df 84 c0 74 04 3c 03 7e 50 c7 04 25 00 00
[ 39.556649][ T5855] RSP: 0018:ffff8880670bfa68 EFLAGS: 00010296
[ 39.557554][ T5855] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffff1100ce17f38
[ 39.558758][ T5855] RDX: dffffc0000000000 RSI: 1ffff1100c870d0e RDI: 0000000000000286
[ 39.559932][ T5855] RBP: ffff8880670bfa70 R08: ffff888064386000 R09: 0000000000000002
[ 39.561080][ T5855] R10: 0000000000000000 R11: ffff88806c5adc7b R12: 0000000000000063
[ 39.562268][ T5855] R13: 0000000000000000 R14: ffffffff89db1720 R15: ffff8880642f7a80
[ 39.563440][ T5855] FS: 00007f3d50457700(0000) GS:ffff88806c580000(0000) knlGS:0000000000000000
[ 39.564751][ T5855] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 39.565722][ T5855] CR2: ffffffffff600400 CR3: 000000005fbba006 CR4: 00000000001606e0
[ 39.566916][ T5855] Call Trace:
[ 39.567434][ T5855] __handle_sysrq.cold+0x153/0x455
[ 39.568173][ T5855] write_sysrq_trigger+0x7c/0x90
[ 39.568886][ T5855] ? sysrq_filter+0xe40/0xe40
[ 39.569562][ T5855] proc_reg_write+0x29a/0x3c0
[ 39.570254][ T5855] ? proc_reg_unlocked_ioctl+0x3b0/0x3b0
[ 39.571067][ T5855] __vfs_write+0x116/0xb40
[ 39.571708][ T5855] ? check_preemption_disabled+0x48/0x290
[ 39.572531][ T5855] ? proc_reg_unlocked_ioctl+0x3b0/0x3b0
[ 39.573372][ T5855] ? kernel_read+0x120/0x120
[ 39.574049][ T5855] ? __lock_is_held+0xb6/0x140
[ 39.574745][ T5855] ? rcu_read_lock_sched_held+0x110/0x130
[ 39.575569][ T5855] ? rcu_sync_lockdep_assert+0x73/0xb0
[ 39.576359][ T5855] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 39.577261][ T5855] ? __sb_start_write+0x1ac/0x360
[ 39.578015][ T5855] vfs_write+0x20c/0x580
[ 39.578644][ T5855] ksys_write+0x105/0x260
[ 39.579279][ T5855] ? __ia32_sys_read+0xb0/0xb0
[ 39.579962][ T5855] ? __ia32_sys_dup3+0xb0/0xb0
[ 39.580650][ T5855] ? trace_hardirqs_off_caller+0x300/0x300
[ 39.581482][ T5855] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 39.582272][ T5855] __x64_sys_write+0x73/0xb0
[ 39.582935][ T5855] do_syscall_64+0x1a3/0x800
[ 39.583597][ T5855] ? syscall_return_slowpath+0x5f0/0x5f0
[ 39.584402][ T5855] ? prepare_exit_to_usermode+0x232/0x3b0
[ 39.585214][ T5855] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 39.586017][ T5855] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 39.586853][ T5855] RIP: 0033:0x7f3d4fb58370
[ 39.587491][ T5855] Code: 73 01 c3 48 8b 0d c8 4a 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d 85 a2 2b 00 00 75 10 b8 01 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 0e 8a 01 00 48 89 04 24
[ 39.590264][ T5855] RSP: 002b:00007ffea37d97e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 39.591447][ T5855] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f3d4fb58370
[ 39.592570][ T5855] RDX: 0000000000000001 RSI: 0000000001b08808 RDI: 0000000000000001
[ 39.593693][ T5855] RBP: 0000000001b08808 R08: 00007f3d50457700 R09: 00000000ffffffff
[ 39.594838][ T5855] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3d4fe0d7a0
[ 39.595959][ T5855] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000001b0744a
[ 39.597088][ T5855] Modules linked in:
[ 39.597710][ T5855] ---[ end trace d90fce28de6a4a5f ]---
[ 39.598508][ T5855] RIP: 0010:sysrq_handle_crash+0x5e/0xd0
[ 39.599310][ T5855] Code: db 74 46 e8 34 d9 a5 fd e8 cf 7a 90 fd e8 2a d9 a5 fd 48 c7 c2 c7 27 dc 83 be 01 00 00 00 48 c7 c7 00 3d 9a 89 e8 d2 13 88 fd <a0> 00 00 00 00 00 fc ff df 84 c0 74 04 3c 03 7e 50 c7 04 25 00 00
[ 39.602084][ T5855] RSP: 0018:ffff8880670bfa68 EFLAGS: 00010296
[ 39.602968][ T5855] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 1ffff1100ce17f38
[ 39.604107][ T5855] RDX: dffffc0000000000 RSI: 1ffff1100c870d0e RDI: 0000000000000286
[ 39.605233][ T5855] RBP: ffff8880670bfa70 R08: ffff888064386000 R09: 0000000000000002
[ 39.606411][ T5855] R10: 0000000000000000 R11: ffff88806c5adc7b R12: 0000000000000063
Message from sy[ 39.607561][ T5855] R13: 0000000000000000 R14: ffffffff89db1720 R15: ffff8880642f7a80
slogd@syzkaller [ 39.608844][ T5855] FS: 00007f3d50457700(0000) GS:ffff88806c580000(0000) knlGS:0000000000000000
at Jan 2 17:25:[ 39.610262][ T5855] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 39.611333][ T5855] CR2: ffffffffff600400 CR3: 000000005fbba006 CR4: 00000000001606e0
[ 39.612524][ T5855] Kernel panic - not syncing: Fatal exception
[ 39.613766][ T5855] Kernel Offset: disabled
[ 39.614397][ T5855] Rebooting in 86400 seconds..
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