Warning: Permanently added '10.128.0.119' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 225.816710][ T7614] FS-Cache: Duplicate cookie detected [ 225.822319][ T7614] FS-Cache: O-cookie c=00000000918060d6 [p=0000000027dc5312 fl=212 nc=0 na=0] [ 225.831979][ T7614] FS-Cache: O-cookie d=0000000000000000 n=0000000000000000 [ 225.839261][ T7614] FS-Cache: O-key=[10] '5e5d375b2b255d28247b' [ 225.846277][ T7614] FS-Cache: N-cookie c=0000000021e0c24d [p=0000000027dc5312 fl=2 nc=0 na=1] [ 225.855274][ T7614] FS-Cache: N-cookie d=00000000f4bc531c n=00000000bb6530d1 [ 225.862651][ T7614] FS-Cache: N-key=[10] '5e5d375b2b255d28247b' [ 225.873667][ T2653] ================================================================== [ 225.881975][ T2653] BUG: KASAN: use-after-free in afs_deactivate_cell+0x165/0x1a0 [ 225.889613][ T2653] Read of size 8 at addr ffff888093021080 by task kworker/0:3/2653 [ 225.897502][ T2653] [ 225.899903][ T2653] CPU: 0 PID: 2653 Comm: kworker/0:3 Not tainted 5.9.0-rc7-next-20200929-syzkaller #0 [ 225.909476][ T2653] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 225.919727][ T2653] Workqueue: afs afs_manage_cell [ 225.924698][ T2653] Call Trace: [ 225.928007][ T2653] dump_stack+0x198/0x1fb [ 225.932357][ T2653] ? afs_deactivate_cell+0x165/0x1a0 [ 225.937654][ T2653] ? afs_deactivate_cell+0x165/0x1a0 [ 225.942960][ T2653] print_address_description.constprop.0.cold+0xae/0x497 [ 225.949992][ T2653] ? check_preemption_disabled+0x50/0x130 [ 225.955717][ T2653] ? _raw_spin_lock_irqsave+0xa9/0xd0 [ 225.961086][ T2653] ? vprintk_func+0x95/0x1e0 [ 225.965680][ T2653] ? afs_deactivate_cell+0x165/0x1a0 [ 225.970977][ T2653] ? afs_deactivate_cell+0x165/0x1a0 [ 225.976308][ T2653] kasan_report.cold+0x1f/0x37 [ 225.981095][ T2653] ? afs_deactivate_cell+0x165/0x1a0 [ 225.986399][ T2653] afs_deactivate_cell+0x165/0x1a0 [ 225.991525][ T2653] afs_manage_cell+0x326/0x11c0 [ 225.996400][ T2653] ? afs_cell_destroy+0x240/0x240 [ 226.001437][ T2653] ? do_raw_spin_lock+0x120/0x2b0 [ 226.006479][ T2653] ? lock_is_held_type+0xbb/0xf0 [ 226.011435][ T2653] process_one_work+0x933/0x15a0 executing program [ 226.016390][ T2653] ? pwq_dec_nr_in_flight+0x320/0x320 [ 226.021779][ T2653] ? rwlock_bug.part.0+0x90/0x90 [ 226.026740][ T2653] worker_thread+0x64c/0x1120 [ 226.031443][ T2653] ? __kthread_parkme+0x13f/0x1e0 [ 226.036481][ T2653] ? process_one_work+0x15a0/0x15a0 [ 226.041699][ T2653] kthread+0x3af/0x4a0 [ 226.045782][ T2653] ? __kthread_bind_mask+0xc0/0xc0 [ 226.050908][ T2653] ret_from_fork+0x1f/0x30 [ 226.055339][ T2653] [ 226.057667][ T2653] Allocated by task 7905: [ 226.062003][ T2653] kasan_save_stack+0x1b/0x40 [ 226.066684][ T2653] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 226.072327][ T2653] kmem_cache_alloc_trace+0x1a0/0x480 [ 226.077705][ T2653] afs_lookup_cell+0x5b8/0x1450 [ 226.082562][ T2653] afs_parse_param+0x404/0x8c0 [ 226.087332][ T2653] vfs_parse_fs_param+0x203/0x550 [ 226.092363][ T2653] vfs_parse_fs_string+0xe6/0x150 [ 226.097395][ T2653] generic_parse_monolithic+0x16f/0x1f0 [ 226.102954][ T2653] path_mount+0x1266/0x1e70 [ 226.107467][ T2653] __x64_sys_mount+0x278/0x2f0 [ 226.112234][ T2653] do_syscall_64+0x2d/0x70 [ 226.116743][ T2653] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 226.122635][ T2653] [ 226.124967][ T2653] Freed by task 2653: [ 226.128958][ T2653] kasan_save_stack+0x1b/0x40 [ 226.133723][ T2653] kasan_set_track+0x1c/0x30 [ 226.138329][ T2653] kasan_set_free_info+0x1b/0x30 [ 226.143268][ T2653] __kasan_slab_free+0xd8/0x120 [ 226.148124][ T2653] kfree+0x10e/0x2a0 [ 226.152027][ T2653] rcu_core+0x645/0x1240 [ 226.156296][ T2653] __do_softirq+0x203/0xab6 [ 226.160791][ T2653] [ 226.163117][ T2653] Last call_rcu(): [ 226.166845][ T2653] kasan_save_stack+0x1b/0x40 [ 226.171536][ T2653] kasan_record_aux_stack+0x82/0xb0 [ 226.176744][ T2653] call_rcu+0x15e/0x7d0 [ 226.180914][ T2653] afs_manage_cell+0x250/0x11c0 [ 226.185781][ T2653] process_one_work+0x933/0x15a0 [ 226.190727][ T2653] worker_thread+0x64c/0x1120 [ 226.195416][ T2653] kthread+0x3af/0x4a0 [ 226.199493][ T2653] ret_from_fork+0x1f/0x30 [ 226.203908][ T2653] [ 226.206243][ T2653] The buggy address belongs to the object at ffff888093021000 [ 226.206243][ T2653] which belongs to the cache kmalloc-1k of size 1024 [ 226.220337][ T2653] The buggy address is located 128 bytes inside of [ 226.220337][ T2653] 1024-byte region [ffff888093021000, ffff888093021400) [ 226.233699][ T2653] The buggy address belongs to the page: [ 226.239349][ T2653] page:00000000fb0f011a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x93021 [ 226.249507][ T2653] flags: 0xfffe0000000200(slab) [ 226.254395][ T2653] raw: 00fffe0000000200 ffffea0002992c48 ffffea000249fd08 ffff8880aa040700 [ 226.263004][ T2653] raw: 0000000000000000 ffff888093021000 0000000100000002 0000000000000000 [ 226.271598][ T2653] page dumped because: kasan: bad access detected [ 226.278882][ T2653] [ 226.281216][ T2653] Memory state around the buggy address: [ 226.286858][ T2653] ffff888093020f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 226.294930][ T2653] ffff888093021000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 226.303000][ T2653] >ffff888093021080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 226.311070][ T2653] ^ [ 226.315159][ T2653] ffff888093021100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 226.323246][ T2653] ffff888093021180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 226.331318][ T2653] ================================================================== [ 226.339993][ T2653] Disabling lock debugging due to kernel taint [ 226.374861][ T2653] Kernel panic - not syncing: panic_on_warn set ... [ 226.381492][ T2653] CPU: 0 PID: 2653 Comm: kworker/0:3 Tainted: G B 5.9.0-rc7-next-20200929-syzkaller #0 [ 226.392417][ T2653] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 226.402485][ T2653] Workqueue: afs afs_manage_cell [ 226.407421][ T2653] Call Trace: [ 226.410714][ T2653] dump_stack+0x198/0x1fb [ 226.415053][ T2653] ? afs_deactivate_cell+0xa0/0x1a0 [ 226.420259][ T2653] panic+0x382/0x7fb [ 226.424155][ T2653] ? __warn_printk+0xf3/0xf3 [ 226.428743][ T2653] ? preempt_schedule_common+0x59/0xc0 [ 226.434201][ T2653] ? afs_deactivate_cell+0x165/0x1a0 [ 226.439486][ T2653] ? preempt_schedule_thunk+0x16/0x18 [ 226.444858][ T2653] ? trace_hardirqs_on+0x51/0x1c0 [ 226.449883][ T2653] ? afs_deactivate_cell+0x165/0x1a0 [ 226.455163][ T2653] ? afs_deactivate_cell+0x165/0x1a0 [ 226.460536][ T2653] end_report+0x58/0x5e [ 226.464686][ T2653] kasan_report.cold+0xd/0x37 [ 226.469466][ T2653] ? afs_deactivate_cell+0x165/0x1a0 [ 226.474751][ T2653] afs_deactivate_cell+0x165/0x1a0 [ 226.479881][ T2653] afs_manage_cell+0x326/0x11c0 [ 226.484746][ T2653] ? afs_cell_destroy+0x240/0x240 [ 226.489774][ T2653] ? do_raw_spin_lock+0x120/0x2b0 [ 226.494799][ T2653] ? lock_is_held_type+0xbb/0xf0 [ 226.499736][ T2653] process_one_work+0x933/0x15a0 [ 226.504704][ T2653] ? pwq_dec_nr_in_flight+0x320/0x320 [ 226.510081][ T2653] ? rwlock_bug.part.0+0x90/0x90 [ 226.515038][ T2653] worker_thread+0x64c/0x1120 [ 226.519727][ T2653] ? __kthread_parkme+0x13f/0x1e0 [ 226.524756][ T2653] ? process_one_work+0x15a0/0x15a0 [ 226.529951][ T2653] kthread+0x3af/0x4a0 [ 226.534014][ T2653] ? __kthread_bind_mask+0xc0/0xc0 [ 226.539133][ T2653] ret_from_fork+0x1f/0x30 [ 226.545053][ T2653] Kernel Offset: disabled [ 226.549379][ T2653] Rebooting in 86400 seconds..