[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.24' (ECDSA) to the list of known hosts. syzkaller login: [ 84.936129][ T6840] IPVS: ftp: loaded support on port[0] = 21 [ 84.941361][ T6835] IPVS: ftp: loaded support on port[0] = 21 [ 84.945080][ T6838] IPVS: ftp: loaded support on port[0] = 21 [ 84.954062][ T6832] IPVS: ftp: loaded support on port[0] = 21 [ 84.963125][ T6837] IPVS: ftp: loaded support on port[0] = 21 [ 84.975322][ T6839] IPVS: ftp: loaded support on port[0] = 21 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 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 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 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 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 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 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 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 [ 94.716737][T10843] ------------[ cut here ]------------ [ 94.722229][T10843] kernel BUG at fs/inode.c:1668! [ 94.727798][T10882] ------------[ cut here ]------------ [ 94.733261][T10882] kernel BUG at fs/inode.c:1668! [ 94.740673][T10889] ================================================================== [ 94.748932][T10889] BUG: KASAN: use-after-free in eventpoll_release_file+0x11c/0x130 [ 94.756824][T10889] Read of size 8 at addr ffff888099b72ef8 by task syz-executor205/10889 [ 94.765138][T10889] [ 94.767475][T10889] CPU: 0 PID: 10889 Comm: syz-executor205 Not tainted 5.9.0-rc2-syzkaller #0 [ 94.776226][T10889] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.786280][T10889] Call Trace: [ 94.789597][T10889] dump_stack+0x18f/0x20d [ 94.793946][T10889] ? eventpoll_release_file+0x11c/0x130 [ 94.799503][T10889] ? eventpoll_release_file+0x11c/0x130 [ 94.805061][T10889] print_address_description.constprop.0.cold+0xae/0x497 [ 94.812097][T10889] ? vprintk_func+0x97/0x1a6 [ 94.816698][T10889] ? eventpoll_release_file+0x11c/0x130 [ 94.822251][T10889] ? eventpoll_release_file+0x11c/0x130 [ 94.827802][T10889] kasan_report.cold+0x1f/0x37 [ 94.832586][T10889] ? eventpoll_release_file+0x11c/0x130 [ 94.838142][T10889] eventpoll_release_file+0x11c/0x130 [ 94.842467][T10843] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 94.843530][T10889] __fput+0x744/0x920 [ 94.849574][T10843] CPU: 1 PID: 10843 Comm: syz-executor205 Not tainted 5.9.0-rc2-syzkaller #0 [ 94.853529][T10889] task_work_run+0xdd/0x190 [ 94.862248][T10843] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.866731][T10889] exit_to_user_mode_prepare+0x195/0x1c0 [ 94.876756][T10843] RIP: 0010:iput+0x64/0x70 [ 94.882372][T10889] syscall_exit_to_user_mode+0x59/0x2b0 [ 94.886760][T10843] Code: ff 83 e3 40 48 89 de e8 3a d9 ad ff 48 85 db 75 14 e8 90 dc ad ff 48 89 ef e8 58 f7 ff ff 5b 5d e9 81 dc ad ff e8 7c dc ad ff <0f> 0b e8 05 f5 ed ff eb c5 0f 1f 00 41 56 41 55 41 54 55 48 89 fd [ 94.892279][T10889] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 94.911855][T10843] RSP: 0018:ffffc9000e437e10 EFLAGS: 00010293 [ 94.917720][T10889] RIP: 0033:0x405881 [ 94.923752][T10843] RAX: 0000000000000000 RBX: 0000000000000040 RCX: ffffffff81c66276 [ 94.927617][T10889] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 94.935558][T10843] RDX: ffff8880958f0240 RSI: ffffffff81c66294 RDI: 0000000000000007 [ 94.955132][T10889] RSP: 002b:00007fff97573820 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 94.963078][T10843] RBP: ffff88808520bb40 R08: 0000000000000001 R09: ffff888095cc84e3 [ 94.971471][T10889] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000405881 [ 94.979512][T10843] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 [ 94.987471][T10889] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 94.995417][T10843] R13: ffff88808520baa0 R14: ffff88808520bb40 R15: ffff888089ca5990 [ 95.003359][T10889] RBP: 0000000000000005 R08: 0000000120080522 R09: 0000000120080522 [ 95.011309][T10843] FS: 0000000000f04880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 95.019245][T10889] R10: 00007fff97573840 R11: 0000000000000293 R12: 00000000006dbc4c [ 95.019258][T10889] R13: 000000000000002d R14: 0000000000000064 R15: 0000000000000000 [ 95.028180][T10843] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 95.036122][T10889] [ 95.044078][T10843] CR2: 00007f9a66cab000 CR3: 00000000957e0000 CR4: 00000000001506e0 [ 95.050631][T10889] Allocated by task 10893: [ 95.052933][T10843] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 95.060883][T10889] kasan_save_stack+0x1b/0x40 [ 95.065262][T10843] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 95.073208][T10889] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 95.077845][T10843] Call Trace: [ 95.085797][T10889] kmem_cache_alloc+0x138/0x3a0 [ 95.091399][T10843] __sock_release+0x20c/0x280 [ 95.094653][T10889] __alloc_file+0x21/0x350 [ 95.099473][T10843] sock_close+0x18/0x20 [ 95.104116][T10889] alloc_empty_file+0x6d/0x170 [ 95.108500][T10843] __fput+0x285/0x920 [ 95.112624][T10889] alloc_file+0x5e/0x5a0 [ 95.117360][T10843] ? __sock_release+0x280/0x280 [ 95.121309][T10889] alloc_file_pseudo+0x165/0x250 [ 95.125525][T10843] task_work_run+0xdd/0x190 [ 95.130344][T10889] sock_alloc_file+0x4f/0x190 [ 95.135256][T10843] exit_to_user_mode_prepare+0x195/0x1c0 [ 95.139722][T10889] __sys_socket+0x13d/0x200 [ 95.144395][T10843] syscall_exit_to_user_mode+0x59/0x2b0 [ 95.149991][T10889] __x64_sys_socket+0x6f/0xb0 [ 95.154471][T10843] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 95.159983][T10889] do_syscall_64+0x2d/0x70 [ 95.164623][T10843] RIP: 0033:0x405881 [ 95.170486][T10889] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 95.174873][T10843] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 95.178737][T10889] [ 95.184601][T10843] RSP: 002b:00007fff97573820 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 95.204174][T10889] Freed by task 9: [ 95.206478][T10843] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000405881 [ 95.214879][T10889] kasan_save_stack+0x1b/0x40 [ 95.218565][T10843] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 95.226514][T10889] kasan_set_track+0x1c/0x30 [ 95.231170][T10843] RBP: 0000000000000005 R08: 0000000120080522 R09: 0000000120080522 [ 95.239118][T10889] kasan_set_free_info+0x1b/0x30 [ 95.243700][T10843] R10: 00007fff97573840 R11: 0000000000000293 R12: 00000000006dbc4c [ 95.251660][T10889] __kasan_slab_free+0xd8/0x120 [ 95.256562][T10843] R13: 000000000000002d R14: 0000000000000064 R15: 0000000000000000 [ 95.264510][T10889] kmem_cache_free.part.0+0x67/0x1f0 [ 95.269324][T10843] Modules linked in: [ 95.277287][T10889] rcu_core+0x5c7/0x1190 [ 95.290664][T10889] __do_softirq+0x2de/0xa24 [ 95.295153][T10889] [ 95.297468][T10889] Last call_rcu(): [ 95.301186][T10889] kasan_save_stack+0x1b/0x40 [ 95.305868][T10889] kasan_record_aux_stack+0x82/0xb0 [ 95.311066][T10889] call_rcu+0x14f/0x7e0 [ 95.315224][T10889] task_work_run+0xdd/0x190 [ 95.319726][T10889] exit_to_user_mode_prepare+0x195/0x1c0 [ 95.325355][T10889] syscall_exit_to_user_mode+0x59/0x2b0 [ 95.330898][T10889] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 95.336774][T10889] [ 95.339088][T10889] Second to last call_rcu(): [ 95.343676][T10889] kasan_save_stack+0x1b/0x40 [ 95.345688][T10882] invalid opcode: 0000 [#2] PREEMPT SMP KASAN [ 95.348352][T10889] kasan_record_aux_stack+0x82/0xb0 [ 95.354395][T10882] CPU: 1 PID: 10882 Comm: syz-executor205 Tainted: G D 5.9.0-rc2-syzkaller #0 [ 95.359558][T10889] call_rcu+0x14f/0x7e0 [ 95.369666][T10882] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 95.373796][T10889] task_work_run+0xdd/0x190 [ 95.383825][T10882] RIP: 0010:iput+0x64/0x70 [ 95.388296][T10889] exit_to_user_mode_prepare+0x195/0x1c0 [ 95.392683][T10882] Code: ff 83 e3 40 48 89 de e8 3a d9 ad ff 48 85 db 75 14 e8 90 dc ad ff 48 89 ef e8 58 f7 ff ff 5b 5d e9 81 dc ad ff e8 7c dc ad ff <0f> 0b e8 05 f5 ed ff eb c5 0f 1f 00 41 56 41 55 41 54 55 48 89 fd [ 95.398287][T10889] syscall_exit_to_user_mode+0x59/0x2b0 [ 95.417854][T10882] RSP: 0018:ffffc9000e497e10 EFLAGS: 00010293 [ 95.423377][T10889] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 95.429406][T10882] RAX: 0000000000000000 RBX: 0000000000000040 RCX: ffffffff81c66276 [ 95.435262][T10889] [ 95.443210][T10882] RDX: ffff888095cc84c0 RSI: ffffffff81c66294 RDI: 0000000000000007 [ 95.445514][T10889] The buggy address belongs to the object at ffff888099b72d40 [ 95.445514][T10889] which belongs to the cache filp of size 488 [ 95.453456][T10882] RBP: ffff8880852170c0 R08: 0000000000000001 R09: ffff888091fae2e3 [ 95.466870][T10889] The buggy address is located 440 bytes inside of [ 95.466870][T10889] 488-byte region [ffff888099b72d40, ffff888099b72f28) [ 95.474809][T10882] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 95.488062][T10889] The buggy address belongs to the page: [ 95.496271][T10882] R13: ffff888085217020 R14: ffff8880852170c0 R15: ffff888085006c40 [ 95.501877][T10889] page:0000000056bb8a9f refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888099b72ac0 pfn:0x99b72 [ 95.509818][T10882] FS: 0000000000f04880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 95.521230][T10889] flags: 0xfffe0000000200(slab) [ 95.530129][T10882] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 95.534954][T10889] raw: 00fffe0000000200 ffffea000268afc8 ffffea00025a3888 ffff88821bc47b00 [ 95.541508][T10882] CR2: 00007f9a66caf000 CR3: 0000000099f72000 CR4: 00000000001506e0 [ 95.550062][T10889] raw: ffff888099b72ac0 ffff888099b720c0 0000000100000005 0000000000000000 [ 95.558004][T10882] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 95.566556][T10889] page dumped because: kasan: bad access detected [ 95.574502][T10882] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 95.580880][T10889] [ 95.588837][T10882] Call Trace: [ 95.591144][T10889] Memory state around the buggy address: [ 95.594417][T10882] __sock_release+0x20c/0x280 [ 95.600011][T10889] ffff888099b72d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.604664][T10882] sock_close+0x18/0x20 [ 95.612689][T10889] ffff888099b72e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.616821][T10882] __fput+0x285/0x920 [ 95.624850][T10889] >ffff888099b72e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.628804][T10882] ? __sock_release+0x280/0x280 [ 95.636826][T10889] ^ [ 95.641656][T10882] task_work_run+0xdd/0x190 [ 95.649595][T10889] ffff888099b72f00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc [ 95.654077][T10882] exit_to_user_mode_prepare+0x195/0x1c0 [ 95.662098][T10889] ffff888099b72f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 95.667707][T10882] syscall_exit_to_user_mode+0x59/0x2b0 [ 95.675730][T10889] ================================================================== [ 95.681250][T10882] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 95.695147][T10882] RIP: 0033:0x405881 [ 95.699041][T10882] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 6a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 b3 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 95.718649][T10882] RSP: 002b:00007fff97573820 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 95.723085][T10843] ---[ end trace d33260be7fc77001 ]--- [ 95.727052][T10882] RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000405881 [ 95.727059][T10882] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 95.727066][T10882] RBP: 0000000000000005 R08: 0000000120080522 R09: 0000000120080522 [ 95.727073][T10882] R10: 00007fff97573840 R11: 0000000000000293 R12: 00000000006dbc4c [ 95.727086][T10882] R13: 000000000000002d R14: 0000000000000064 R15: 0000000000000000 [ 95.732554][T10843] RIP: 0010:iput+0x64/0x70 [ 95.740490][T10882] Modules linked in: [ 95.753025][T10882] ---[ end trace d33260be7fc77002 ]--- [ 95.802762][T10882] RIP: 0010:iput+0x64/0x70 [ 95.807655][T10882] Code: ff 83 e3 40 48 89 de e8 3a d9 ad ff 48 85 db 75 14 e8 90 dc ad ff 48 89 ef e8 58 f7 ff ff 5b 5d e9 81 dc ad ff e8 7c dc ad ff <0f> 0b e8 05 f5 ed ff eb c5 0f 1f 00 41 56 41 55 41 54 55 48 89 fd [ 95.856714][T10882] RSP: 0018:ffffc9000e437e10 EFLAGS: 00010293 [ 95.862963][T10882] RAX: 0000000000000000 RBX: 0000000000000040 RCX: ffffffff81c66276 [ 95.871427][T10882] RDX: ffff8880958f0240 RSI: ffffffff81c66294 RDI: 0000000000000007 [ 95.875774][T10843] Code: ff 83 e3 40 48 89 de e8 3a d9 ad ff 48 85 db 75 14 e8 90 dc ad ff 48 89 ef e8 58 f7 ff ff 5b 5d e9 81 dc ad ff e8 7c dc ad ff <0f> 0b e8 05 f5 ed ff eb c5 0f 1f 00 41 56 41 55 41 54 55 48 89 fd [ 95.879829][T10882] RBP: ffff88808520bb40 R08: 0000000000000001 R09: ffff888095cc84e3 [ 95.922281][T10882] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 [ 95.942417][T10882] R13: ffff88808520baa0 R14: ffff88808520bb40 R15: ffff888089ca5990 [ 95.972594][T10882] FS: 0000000000f04880(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 95.987073][T10882] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 96.004265][T10882] CR2: 00007effa003d108 CR3: 0000000099f72000 CR4: 00000000001506e0 [ 96.028627][T10882] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 96.042344][T10882] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 96.053276][T10843] RSP: 0018:ffffc9000e437e10 EFLAGS: 00010293 [ 96.062701][T10882] Kernel panic - not syncing: Fatal exception [ 96.069507][T10882] Kernel Offset: disabled [ 96.073825][T10882] Rebooting in 86400 seconds..