Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.16' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 73.027440][ T8508] ================================================================== [ 73.035697][ T8508] BUG: KASAN: null-ptr-deref in bdi_put+0x22/0xa0 [ 73.042128][ T8508] Write of size 4 at addr 0000000000000040 by task syz-executor465/8508 [ 73.050451][ T8508] [ 73.052765][ T8508] CPU: 1 PID: 8508 Comm: syz-executor465 Not tainted 5.10.0-next-20201221-syzkaller #0 [ 73.062639][ T8508] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.072681][ T8508] Call Trace: [ 73.075957][ T8508] dump_stack+0x107/0x163 [ 73.080304][ T8508] ? bdi_put+0x22/0xa0 [ 73.084366][ T8508] ? bdi_put+0x22/0xa0 [ 73.088427][ T8508] kasan_report.cold+0x5f/0xd5 [ 73.093229][ T8508] ? bdi_put+0x22/0xa0 [ 73.097293][ T8508] check_memory_region+0x13d/0x180 [ 73.102435][ T8508] bdi_put+0x22/0xa0 [ 73.106322][ T8508] bdev_evict_inode+0x280/0x4a0 [ 73.111199][ T8508] ? __blkdev_direct_IO_simple+0x930/0x930 [ 73.117007][ T8508] evict+0x2ed/0x6b0 [ 73.120940][ T8508] iput.part.0+0x41e/0x840 [ 73.125346][ T8508] ? __remove_inode_hash+0x130/0x130 [ 73.130631][ T8508] iput+0x58/0x70 [ 73.134260][ T8508] dentry_unlink_inode+0x2b1/0x3d0 [ 73.139371][ T8508] __dentry_kill+0x3c0/0x640 [ 73.143950][ T8508] ? dput+0x35/0xc10 [ 73.147873][ T8508] ? dput+0x35/0xc10 [ 73.151758][ T8508] dput+0x786/0xc10 [ 73.155559][ T8508] shrink_dcache_for_umount+0x11f/0x330 [ 73.161122][ T8508] generic_shutdown_super+0x68/0x370 [ 73.166412][ T8508] kill_anon_super+0x36/0x60 [ 73.170995][ T8508] deactivate_locked_super+0x94/0x160 [ 73.176376][ T8508] deactivate_super+0xad/0xd0 [ 73.181042][ T8508] cleanup_mnt+0x3a3/0x530 [ 73.185465][ T8508] task_work_run+0xdd/0x190 [ 73.189963][ T8508] exit_to_user_mode_prepare+0x1f0/0x200 [ 73.195608][ T8508] syscall_exit_to_user_mode+0x19/0x50 [ 73.201060][ T8508] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 73.206945][ T8508] RIP: 0033:0x440219 [ 73.210828][ T8508] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 73.230429][ T8508] RSP: 002b:00007ffc7c8083f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 73.238838][ T8508] RAX: ffffffffffffffea RBX: 0030656c69662f2e RCX: 0000000000440219 [ 73.246799][ T8508] RDX: 00000000200001c0 RSI: 0000000020000300 RDI: 0000000000000000 [ 73.254772][ T8508] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 73.262741][ T8508] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a20 [ 73.270704][ T8508] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 73.278695][ T8508] ================================================================== [ 73.286740][ T8508] Disabling lock debugging due to kernel taint [ 73.293371][ T8508] Kernel panic - not syncing: panic_on_warn set ... [ 73.299968][ T8508] CPU: 1 PID: 8508 Comm: syz-executor465 Tainted: G B 5.10.0-next-20201221-syzkaller #0 [ 73.310991][ T8508] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.321058][ T8508] Call Trace: [ 73.324354][ T8508] dump_stack+0x107/0x163 [ 73.328693][ T8508] panic+0x343/0x77f [ 73.332590][ T8508] ? __warn_printk+0xf3/0xf3 [ 73.337185][ T8508] ? preempt_schedule_common+0x59/0xc0 [ 73.342647][ T8508] ? bdi_put+0x22/0xa0 [ 73.346728][ T8508] ? preempt_schedule_thunk+0x16/0x18 [ 73.352107][ T8508] ? trace_hardirqs_on+0x38/0x1c0 [ 73.357744][ T8508] ? trace_hardirqs_on+0x51/0x1c0 [ 73.362775][ T8508] ? bdi_put+0x22/0xa0 [ 73.366866][ T8508] ? bdi_put+0x22/0xa0 [ 73.370940][ T8508] end_report+0x58/0x5e [ 73.375100][ T8508] kasan_report.cold+0x67/0xd5 [ 73.379900][ T8508] ? bdi_put+0x22/0xa0 [ 73.383980][ T8508] check_memory_region+0x13d/0x180 [ 73.389092][ T8508] bdi_put+0x22/0xa0 [ 73.392991][ T8508] bdev_evict_inode+0x280/0x4a0 [ 73.397861][ T8508] ? __blkdev_direct_IO_simple+0x930/0x930 [ 73.403686][ T8508] evict+0x2ed/0x6b0 [ 73.407584][ T8508] iput.part.0+0x41e/0x840 [ 73.411999][ T8508] ? __remove_inode_hash+0x130/0x130 [ 73.417294][ T8508] iput+0x58/0x70 [ 73.420927][ T8508] dentry_unlink_inode+0x2b1/0x3d0 [ 73.426051][ T8508] __dentry_kill+0x3c0/0x640 [ 73.430671][ T8508] ? dput+0x35/0xc10 [ 73.434573][ T8508] ? dput+0x35/0xc10 [ 73.438752][ T8508] dput+0x786/0xc10 [ 73.442570][ T8508] shrink_dcache_for_umount+0x11f/0x330 [ 73.448132][ T8508] generic_shutdown_super+0x68/0x370 [ 73.453423][ T8508] kill_anon_super+0x36/0x60 [ 73.458020][ T8508] deactivate_locked_super+0x94/0x160 [ 73.463408][ T8508] deactivate_super+0xad/0xd0 [ 73.468087][ T8508] cleanup_mnt+0x3a3/0x530 [ 73.472508][ T8508] task_work_run+0xdd/0x190 [ 73.477017][ T8508] exit_to_user_mode_prepare+0x1f0/0x200 [ 73.482681][ T8508] syscall_exit_to_user_mode+0x19/0x50 [ 73.488147][ T8508] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 73.494044][ T8508] RIP: 0033:0x440219 [ 73.497941][ T8508] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 73.517568][ T8508] RSP: 002b:00007ffc7c8083f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 73.526076][ T8508] RAX: ffffffffffffffea RBX: 0030656c69662f2e RCX: 0000000000440219 [ 73.534047][ T8508] RDX: 00000000200001c0 RSI: 0000000020000300 RDI: 0000000000000000 [ 73.542015][ T8508] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 73.549984][ T8508] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a20 [ 73.557994][ T8508] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 73.566013][ T8508] Kernel Offset: disabled [ 73.570358][ T8508] Rebooting in 86400 seconds..