[ 43.477669][ T6549] sshd (6549) used greatest stack depth: 23304 bytes left [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 55.350951][ T6904] general protection fault, probably for non-canonical address 0xdffffc000000001e: 0000 [#1] PREEMPT SMP KASAN [ 55.363834][ T6904] KASAN: null-ptr-deref in range [0x00000000000000f0-0x00000000000000f7] [ 55.372991][ T6904] CPU: 0 PID: 6904 Comm: systemd-udevd Not tainted 5.8.0-rc3-syzkaller #0 [ 55.381508][ T6904] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.391574][ T6904] RIP: 0010:bdev_read_page+0x35/0x290 [ 55.396953][ T6904] Code: f5 53 48 89 fb 48 83 ec 08 48 89 14 24 e8 03 12 a5 ff 48 8d bb f0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e7 01 00 00 4c 8b bb f0 00 00 00 48 b8 00 00 00 [ 55.416556][ T6904] RSP: 0018:ffffc900019a7530 EFLAGS: 00010206 [ 55.422627][ T6904] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81cf749a [ 55.430599][ T6904] RDX: 000000000000001e RSI: ffffffff81cea51d RDI: 00000000000000f0 [ 55.438656][ T6904] RBP: fff89719b6b00000 R08: 0000000000000001 R09: ffffea00028b10c7 [ 55.446630][ T6904] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 55.454601][ T6904] R13: 0000000000000000 R14: 0038000000000000 R15: ffffc900019a7748 [ 55.462664][ T6904] FS: 00007f50563be8c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 55.471627][ T6904] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.478209][ T6904] CR2: 00000000080c7c81 CR3: 000000009fc41000 CR4: 00000000001406f0 [ 55.486180][ T6904] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.494241][ T6904] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 55.502205][ T6904] Call Trace: [ 55.505498][ T6904] do_mpage_readpage+0x10ca/0x1ef0 [ 55.510626][ T6904] ? lock_downgrade+0x820/0x820 [ 55.515496][ T6904] ? mpage_writepage+0x1b0/0x1b0 [ 55.520440][ T6904] ? __xa_clear_mark+0x110/0x110 [ 55.525383][ T6904] ? lock_is_held_type+0xb0/0xe0 [ 55.530334][ T6904] ? __lock_acquire+0x16e3/0x56e0 [ 55.535553][ T6904] mpage_readahead+0x3a2/0x870 [ 55.540322][ T6904] ? do_mpage_readpage+0x1ef0/0x1ef0 [ 55.545749][ T6904] ? __blkdev_direct_IO_simple+0x940/0x940 [ 55.551736][ T6904] ? lock_downgrade+0x820/0x820 [ 55.556596][ T6904] ? blkdev_write_begin+0x40/0x40 [ 55.561621][ T6904] read_pages+0x1df/0x8d0 [ 55.565953][ T6904] ? read_cache_pages+0x750/0x750 [ 55.570982][ T6904] ? add_to_page_cache_lru+0x2ab/0x5b0 [ 55.576813][ T6904] ? 0xffffffff81000000 [ 55.581348][ T6904] ? alloc_pages_current+0x18f/0x280 [ 55.586638][ T6904] ? __page_cache_alloc+0x10b/0x450 [ 55.591846][ T6904] page_cache_readahead_unbounded+0x572/0x850 [ 55.597929][ T6904] ? lock_acquire+0x1f1/0xad0 [ 55.602612][ T6904] ? read_pages+0x8d0/0x8d0 [ 55.607201][ T6904] ? blk_cgroup_congested+0x1f9/0x3e0 [ 55.612576][ T6904] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 55.618560][ T6904] force_page_cache_readahead+0x2e9/0x460 [ 55.624285][ T6904] page_cache_sync_readahead+0x113/0x130 [ 55.629922][ T6904] generic_file_buffered_read+0x108c/0x27e0 [ 55.635915][ T6904] generic_file_read_iter+0x396/0x4e0 [ 55.641293][ T6904] blkdev_read_iter+0x11b/0x180 [ 55.646157][ T6904] new_sync_read+0x41a/0x6e0 [ 55.650750][ T6904] ? vfs_dedupe_file_range+0x780/0x780 [ 55.656222][ T6904] ? security_file_permission+0x239/0x470 [ 55.661946][ T6904] __vfs_read+0xc9/0x100 [ 55.666199][ T6904] vfs_read+0x1f6/0x420 [ 55.670370][ T6904] ksys_read+0x12d/0x250 [ 55.674665][ T6904] ? kernel_write+0x120/0x120 [ 55.679350][ T6904] do_syscall_64+0x60/0xe0 [ 55.683769][ T6904] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.689657][ T6904] RIP: 0033:0x7f5055505210 [ 55.694063][ T6904] Code: Bad RIP value. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 55.698135][ T6904] RSP: 002b:00007ffc9bf2a688 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 55.706544][ T6904] RAX: ffffffffffffffda RBX: 000055c6dddf6c00 RCX: 00007f5055505210 [ 55.714521][ T6904] RDX: 0000000000000040 RSI: 000055c6dddf6c28 RDI: 000000000000000f [ 55.722501][ T6904] RBP: 000055c6ddde3120 R08: 00007f50554efc38 R09: 0000000000000070 [ 55.730907][ T6904] R10: 000000000000006d R11: 0000000000000246 R12: 2000024000070000 [ 55.739655][ T6904] R13: 2000024000070040 R14: 000055c6ddde3170 R15: 0000000000000040 [ 55.747712][ T6904] Modules linked in: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 55.855008][ T6904] ---[ end trace 81383b6dbbd90a99 ]--- [ 55.868109][ T6904] RIP: 0010:bdev_read_page+0x35/0x290 [ 55.880701][ T6904] Code: f5 53 48 89 fb 48 83 ec 08 48 89 14 24 e8 03 12 a5 ff 48 8d bb f0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e7 01 00 00 4c 8b bb f0 00 00 00 48 b8 00 00 00 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 55.905184][ T6904] RSP: 0018:ffffc900019a7530 EFLAGS: 00010206 [ 55.914929][ T6904] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81cf749a [ 55.933149][ T6904] RDX: 000000000000001e RSI: ffffffff81cea51d RDI: 00000000000000f0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 55.949865][ T6904] RBP: fff89719b6b00000 R08: 0000000000000001 R09: ffffea00028b10c7 [ 55.963119][ T6904] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 55.975318][ T6904] R13: 0000000000000000 R14: 0038000000000000 R15: ffffc900019a7748 [ 55.992483][ T6904] FS: 00007f50563be8c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 56.006137][ T6904] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 56.020111][ T6904] CR2: 00000000f7f74db0 CR3: 000000009fc41000 CR4: 00000000001406f0 [ 56.036745][ T6904] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 executing program [ 56.051747][ T6904] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 56.062020][ T6904] Kernel panic - not syncing: Fatal exception [ 56.069719][ T6904] Kernel Offset: disabled [ 56.074161][ T6904] Rebooting in 86400 seconds..