[ 58.997994][ T374] process_one_work+0x965/0x1690 [ 59.002965][ T374] ? lock_release+0x800/0x800 [ 59.007651][ T374] ? pwq_dec_nr_in_flight+0x310/0x310 [ 59.013035][ T374] ? rwlock_bug.part.0+0x90/0x90 [ 59.017989][ T374] worker_thread+0x96/0xe10 [ 59.022516][ T374] ? process_one_work+0x1690/0x1690 [ 59.027721][ T374] kthread+0x3b5/0x4a0 [ 59.031798][ T374] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 59.037525][ T374] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 59.043378][ T374] ret_from_fork+0x1f/0x30 [ 60.741480][ T6786] BUG: using smp_processor_id() in preemptible [00000000] code: systemd-rfkill/6786 [ 60.751435][ T6786] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 60.757584][ T6786] CPU: 1 PID: 6786 Comm: systemd-rfkill Not tainted 5.8.0-rc1-syzkaller #0 [ 60.766549][ T6786] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.776777][ T6786] Call Trace: [ 60.780071][ T6786] dump_stack+0x18f/0x20d [ 60.784403][ T6786] check_preemption_disabled+0x20d/0x220 [ 60.790022][ T6786] ext4_mb_new_blocks+0xa4d/0x3b70 [ 60.795122][ T6786] ? ext4_ext_search_right+0x2ca/0xb20 [ 60.800555][ T6786] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 60.806282][ T6786] ext4_ext_map_blocks+0x201b/0x33e0 [ 60.811567][ T6786] ? ext4_ext_release+0x10/0x10 [ 60.816509][ T6786] ? down_write_killable+0x170/0x170 [ 60.821777][ T6786] ? ext4_es_lookup_extent+0x41d/0xd10 [ 60.827397][ T6786] ext4_map_blocks+0x4cb/0x1640 [ 60.832234][ T6786] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 60.837424][ T6786] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 60.842970][ T6786] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 60.848957][ T6786] ? prandom_u32_state+0xe/0x170 [ 60.853881][ T6786] ? __brelse+0x84/0xa0 [ 60.858020][ T6786] ? __ext4_new_inode+0x144/0x55e0 [ 60.863139][ T6786] ext4_getblk+0xad/0x520 [ 60.867558][ T6786] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 60.873419][ T6786] ? ext4_free_inode+0x1700/0x1700 [ 60.878526][ T6786] ext4_bread+0x7c/0x380 [ 60.882757][ T6786] ? ext4_getblk+0x520/0x520 [ 60.887342][ T6786] ? dquot_get_next_dqblk+0x180/0x180 [ 60.892968][ T6786] ext4_append+0x153/0x360 [ 60.897513][ T6786] ext4_mkdir+0x5e0/0xdf0 [ 60.902475][ T6786] ? ext4_rmdir+0xde0/0xde0 [ 60.907258][ T6786] ? security_inode_permission+0xc4/0xf0 [ 60.912898][ T6786] vfs_mkdir+0x419/0x690 [ 60.917164][ T6786] do_mkdirat+0x21e/0x280 [ 60.921526][ T6786] ? __ia32_sys_mknod+0xb0/0xb0 [ 60.926384][ T6786] ? do_syscall_64+0x1c/0xe0 [ 60.930960][ T6786] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 60.936923][ T6786] do_syscall_64+0x60/0xe0 [ 60.941332][ T6786] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 60.947201][ T6786] RIP: 0033:0x7f8de1613687 [ 60.951607][ T6786] Code: Bad RIP value. [ 60.955658][ T6786] RSP: 002b:00007ffcf3e8b348 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 60.964140][ T6786] RAX: ffffffffffffffda RBX: 000055a9898af985 RCX: 00007f8de1613687 [ 60.972114][ T6786] RDX: 00007ffcf3e8b210 RSI: 00000000000001ed RDI: 000055a9898af985 [ 60.980082][ T6786] RBP: 00007f8de1613680 R08: 0000000000000100 R09: 0000000000000000 [ 60.988052][ T6786] R10: 000055a9898af980 R11: 0000000000000246 R12: 00000000000001ed [ 60.996005][ T6786] R13: 00007ffcf3e8b4d0 R14: 0000000000000000 R15: 0000000000000000 Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 64.327452][ T21] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:1/21 [ 64.336569][ T21] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.342451][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.350670][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.360900][ T21] Workqueue: writeback wb_workfn (flush-8:0) [ 64.367057][ T21] Call Trace: [ 64.370424][ T21] dump_stack+0x18f/0x20d [ 64.374753][ T21] check_preemption_disabled+0x20d/0x220 [ 64.380401][ T21] ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.385737][ T21] ? ext4_find_extent+0x81a/0xad0 [ 64.390769][ T21] ? ext4_ext_search_right+0x2ca/0xb20 [ 64.396211][ T21] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 64.401925][ T21] ext4_ext_map_blocks+0x201b/0x33e0 [ 64.407211][ T21] ? ext4_ext_release+0x10/0x10 [ 64.412050][ T21] ? down_write_killable+0x170/0x170 [ 64.417347][ T21] ? ext4_es_lookup_extent+0x41d/0xd10 [ 64.422800][ T21] ext4_map_blocks+0x4cb/0x1640 [ 64.427635][ T21] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 64.432816][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.438865][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.445287][ T21] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 64.450846][ T21] ext4_writepages+0x1a7b/0x33c0 [ 64.455802][ T21] ? __ext4_mark_inode_dirty+0x940/0x940 [ 64.461615][ T21] ? __lock_acquire+0x2224/0x48b0 [ 64.467171][ T21] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 64.473209][ T21] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 64.479314][ T21] ? __ext4_mark_inode_dirty+0x940/0x940 [ 64.485218][ T21] ? do_writepages+0xfa/0x2a0 [ 64.489918][ T21] do_writepages+0xfa/0x2a0 [ 64.494434][ T21] ? page_writeback_cpu_online+0x10/0x10 [ 64.500962][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.506696][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.512676][ T21] ? lock_downgrade+0x840/0x840 [ 64.517527][ T21] __writeback_single_inode+0x12a/0x13d0 [ 64.523169][ T21] ? _raw_spin_unlock+0x24/0x40 [ 64.528028][ T21] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 64.534026][ T21] writeback_sb_inodes+0x515/0xdc0 [ 64.539138][ T21] ? __writeback_single_inode+0x13d0/0x13d0 [ 64.545556][ T21] __writeback_inodes_wb+0xc3/0x250 [ 64.551252][ T21] wb_writeback+0x8db/0xd50 [ 64.556691][ T21] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 64.563214][ T21] ? cpumask_next+0x3c/0x40 [ 64.568100][ T21] ? get_nr_dirty_inodes+0xd6/0x130 [ 64.574705][ T21] wb_workfn+0x9bc/0x1090 [ 64.579302][ T21] ? inode_wait_for_writeback+0x30/0x30 [ 64.584844][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.590371][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.596380][ T21] process_one_work+0x965/0x1690 [ 64.601343][ T21] ? lock_release+0x800/0x800 [ 64.606007][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.611397][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 64.616330][ T21] worker_thread+0x96/0xe10 [ 64.620833][ T21] ? process_one_work+0x1690/0x1690 [ 64.626030][ T21] kthread+0x3b5/0x4a0 [ 64.630076][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.635830][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.641573][ T21] ret_from_fork+0x1f/0x30 [ 64.648372][ T21] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:1/21 [ 64.657624][ T21] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.663533][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.671950][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.682016][ T21] Workqueue: writeback wb_workfn (flush-8:0) [ 64.688108][ T21] Call Trace: [ 64.691407][ T21] dump_stack+0x18f/0x20d [ 64.695905][ T21] check_preemption_disabled+0x20d/0x220 [ 64.701609][ T21] ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.706704][ T21] ? ext4_find_extent+0x81a/0xad0 [ 64.711712][ T21] ? ext4_ext_search_right+0x2ca/0xb20 [ 64.717167][ T21] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 64.722882][ T21] ext4_ext_map_blocks+0x201b/0x33e0 [ 64.728187][ T21] ? ext4_ext_release+0x10/0x10 [ 64.733034][ T21] ? down_write_killable+0x170/0x170 [ 64.738305][ T21] ? ext4_es_lookup_extent+0x41d/0xd10 [ 64.743749][ T21] ext4_map_blocks+0x4cb/0x1640 [ 64.748588][ T21] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 64.753773][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.759297][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.765252][ T21] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 64.770691][ T21] ext4_writepages+0x1a7b/0x33c0 [ 64.775620][ T21] ? __ext4_mark_inode_dirty+0x940/0x940 [ 64.781235][ T21] ? __lock_acquire+0x2224/0x48b0 [ 64.786254][ T21] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 64.792230][ T21] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 64.798190][ T21] ? __ext4_mark_inode_dirty+0x940/0x940 [ 64.803888][ T21] ? do_writepages+0xfa/0x2a0 [ 64.808554][ T21] do_writepages+0xfa/0x2a0 [ 64.813128][ T21] ? page_writeback_cpu_online+0x10/0x10 [ 64.818866][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.824483][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.830450][ T21] ? lock_downgrade+0x840/0x840 [ 64.835289][ T21] __writeback_single_inode+0x12a/0x13d0 [ 64.840905][ T21] ? _raw_spin_unlock+0x24/0x40 [ 64.845732][ T21] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 64.851691][ T21] writeback_sb_inodes+0x515/0xdc0 [ 64.856789][ T21] ? __writeback_single_inode+0x13d0/0x13d0 [ 64.862671][ T21] __writeback_inodes_wb+0xc3/0x250 [ 64.867853][ T21] wb_writeback+0x8db/0xd50 [ 64.872367][ T21] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 64.878796][ T21] ? cpumask_next+0x3c/0x40 [ 64.883311][ T21] ? get_nr_dirty_inodes+0xd6/0x130 [ 64.888496][ T21] wb_workfn+0x9bc/0x1090 [ 64.892812][ T21] ? inode_wait_for_writeback+0x30/0x30 [ 64.898528][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 64.904060][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 64.910032][ T21] process_one_work+0x965/0x1690 [ 64.914967][ T21] ? lock_release+0x800/0x800 [ 64.919625][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 64.924976][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 64.929924][ T21] worker_thread+0x96/0xe10 [ 64.934421][ T21] ? process_one_work+0x1690/0x1690 [ 64.939622][ T21] kthread+0x3b5/0x4a0 [ 64.943677][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.949483][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 64.955283][ T21] ret_from_fork+0x1f/0x30 [ 64.960865][ T21] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:1/21 [ 64.970042][ T21] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 64.975948][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 64.984244][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.994417][ T21] Workqueue: writeback wb_workfn (flush-8:0) [ 65.000387][ T21] Call Trace: [ 65.003660][ T21] dump_stack+0x18f/0x20d [ 65.007988][ T21] check_preemption_disabled+0x20d/0x220 [ 65.013598][ T21] ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.018693][ T21] ? ext4_find_extent+0x81a/0xad0 [ 65.023723][ T21] ? ext4_ext_search_right+0x2ca/0xb20 [ 65.029171][ T21] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 65.034896][ T21] ext4_ext_map_blocks+0x201b/0x33e0 [ 65.040272][ T21] ? ext4_ext_release+0x10/0x10 [ 65.045111][ T21] ? down_write_killable+0x170/0x170 [ 65.050375][ T21] ? ext4_es_lookup_extent+0x41d/0xd10 [ 65.055812][ T21] ext4_map_blocks+0x4cb/0x1640 [ 65.060646][ T21] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 65.065841][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.071376][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.077332][ T21] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 65.082770][ T21] ext4_writepages+0x1a7b/0x33c0 [ 65.087700][ T21] ? __ext4_mark_inode_dirty+0x940/0x940 [ 65.093449][ T21] ? __lock_acquire+0x2224/0x48b0 [ 65.098478][ T21] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 65.104462][ T21] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 65.110439][ T21] ? __ext4_mark_inode_dirty+0x940/0x940 [ 65.116055][ T21] ? do_writepages+0xfa/0x2a0 [ 65.120714][ T21] do_writepages+0xfa/0x2a0 [ 65.125223][ T21] ? page_writeback_cpu_online+0x10/0x10 [ 65.130947][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.136472][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.142453][ T21] ? lock_downgrade+0x840/0x840 [ 65.147302][ T21] __writeback_single_inode+0x12a/0x13d0 [ 65.152919][ T21] ? _raw_spin_unlock+0x24/0x40 [ 65.157760][ T21] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 65.163734][ T21] writeback_sb_inodes+0x515/0xdc0 [ 65.168836][ T21] ? __writeback_single_inode+0x13d0/0x13d0 [ 65.174731][ T21] __writeback_inodes_wb+0xc3/0x250 [ 65.179925][ T21] wb_writeback+0x8db/0xd50 [ 65.184414][ T21] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 65.190747][ T21] ? cpumask_next+0x3c/0x40 [ 65.195230][ T21] ? get_nr_dirty_inodes+0xd6/0x130 [ 65.200423][ T21] wb_workfn+0x9bc/0x1090 [ 65.204734][ T21] ? inode_wait_for_writeback+0x30/0x30 [ 65.210261][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.215781][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.221740][ T21] process_one_work+0x965/0x1690 [ 65.226662][ T21] ? lock_release+0x800/0x800 [ 65.231316][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.236666][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 65.241599][ T21] worker_thread+0x96/0xe10 [ 65.246086][ T21] ? process_one_work+0x1690/0x1690 [ 65.251282][ T21] kthread+0x3b5/0x4a0 [ 65.255327][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.261126][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.266848][ T21] ret_from_fork+0x1f/0x30 [ 65.282452][ T21] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u4:1/21 [ 65.291619][ T21] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.297619][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc1-syzkaller #0 [ 65.305855][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.315922][ T21] Workqueue: writeback wb_workfn (flush-8:0) [ 65.321904][ T21] Call Trace: [ 65.325209][ T21] dump_stack+0x18f/0x20d [ 65.329556][ T21] check_preemption_disabled+0x20d/0x220 [ 65.335197][ T21] ext4_mb_new_blocks+0xa4d/0x3b70 [ 65.340321][ T21] ? ext4_find_extent+0x81a/0xad0 [ 65.345373][ T21] ? ext4_ext_search_right+0x2ca/0xb20 [ 65.350847][ T21] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 65.356588][ T21] ext4_ext_map_blocks+0x201b/0x33e0 [ 65.361933][ T21] ? ext4_ext_release+0x10/0x10 [ 65.366825][ T21] ? down_write_killable+0x170/0x170 [ 65.372125][ T21] ? ext4_es_lookup_extent+0x41d/0xd10 [ 65.377580][ T21] ext4_map_blocks+0x4cb/0x1640 [ 65.382420][ T21] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 65.387618][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.393149][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.399111][ T21] ? ext4_alloc_io_end_vec+0x145/0x1c0 [ 65.404558][ T21] ext4_writepages+0x1a7b/0x33c0 [ 65.409508][ T21] ? __ext4_mark_inode_dirty+0x940/0x940 [ 65.415208][ T21] ? __lock_acquire+0x2224/0x48b0 [ 65.420242][ T21] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 65.426210][ T21] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 65.432176][ T21] ? __ext4_mark_inode_dirty+0x940/0x940 [ 65.437802][ T21] ? do_writepages+0xfa/0x2a0 [ 65.442462][ T21] do_writepages+0xfa/0x2a0 [ 65.446953][ T21] ? page_writeback_cpu_online+0x10/0x10 [ 65.452581][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.458292][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.464253][ T21] ? lock_downgrade+0x840/0x840 [ 65.469093][ T21] __writeback_single_inode+0x12a/0x13d0 [ 65.474712][ T21] ? _raw_spin_unlock+0x24/0x40 [ 65.479557][ T21] ? wbc_attach_and_unlock_inode+0x60a/0x9c0 [ 65.485535][ T21] writeback_sb_inodes+0x515/0xdc0 [ 65.490640][ T21] ? __writeback_single_inode+0x13d0/0x13d0 [ 65.496544][ T21] __writeback_inodes_wb+0xc3/0x250 [ 65.501731][ T21] wb_writeback+0x8db/0xd50 [ 65.506241][ T21] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 65.512558][ T21] ? cpumask_next+0x3c/0x40 [ 65.517057][ T21] ? get_nr_dirty_inodes+0xd6/0x130 [ 65.522246][ T21] wb_workfn+0x9bc/0x1090 [ 65.526585][ T21] ? inode_wait_for_writeback+0x30/0x30 [ 65.532130][ T21] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 65.537659][ T21] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 65.543811][ T21] process_one_work+0x965/0x1690 [ 65.548861][ T21] ? lock_release+0x800/0x800 [ 65.553534][ T21] ? pwq_dec_nr_in_flight+0x310/0x310 [ 65.558915][ T21] ? rwlock_bug.part.0+0x90/0x90 [ 65.563869][ T21] worker_thread+0x96/0xe10 [ 65.568367][ T21] ? process_one_work+0x1690/0x1690 [ 65.573559][ T21] kthread+0x3b5/0x4a0 [ 65.577611][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 Warning: Permanently added '10.128.15.201' (ECDSA) to the list of known hosts. [ 65.583323][ T21] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 65.589052][ T21] ret_from_fork+0x1f/0x30 2020/06/16 18:03:29 fuzzer started 2020/06/16 18:03:29 connecting to host at 10.128.0.26:40105 2020/06/16 18:03:29 checking machine... 2020/06/16 18:03:29 checking revisions... 2020/06/16 18:03:29 testing simple program... [ 66.349958][ T6808] BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6808 [ 66.359243][ T6808] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 66.365138][ T6808] CPU: 0 PID: 6808 Comm: syz-fuzzer Not tainted 5.8.0-rc1-syzkaller #0 [ 66.373576][ T6808] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.383625][ T6808] Call Trace: [ 66.386905][ T6808] dump_stack+0x18f/0x20d [ 66.391231][ T6808] check_preemption_disabled+0x20d/0x220 [ 66.396844][ T6808] ext4_mb_new_blocks+0xa4d/0x3b70 [ 66.401938][ T6808] ? ext4_ext_search_right+0x2ca/0xb20 [ 66.407374][ T6808] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 66.413073][ T6808] ext4_ext_map_blocks+0x201b/0x33e0 [ 66.418341][ T6808] ? ext4_ext_release+0x10/0x10 [ 66.423190][ T6808] ? down_write_killable+0x170/0x170 [ 66.428456][ T6808] ? ext4_es_lookup_extent+0x41d/0xd10 [ 66.433896][ T6808] ext4_map_blocks+0x4cb/0x1640 [ 66.438739][ T6808] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 66.443914][ T6808] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 66.449443][ T6808] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.455399][ T6808] ? prandom_u32_state+0xe/0x170 [ 66.460318][ T6808] ? __brelse+0x84/0xa0 [ 66.464450][ T6808] ? __ext4_new_inode+0x144/0x55e0 [ 66.469557][ T6808] ext4_getblk+0xad/0x520 [ 66.473914][ T6808] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 66.479795][ T6808] ? ext4_free_inode+0x1700/0x1700 [ 66.484898][ T6808] ext4_bread+0x7c/0x380 [ 66.489122][ T6808] ? ext4_getblk+0x520/0x520 [ 66.493729][ T6808] ? dquot_get_next_dqblk+0x180/0x180 [ 66.499091][ T6808] ext4_append+0x153/0x360 [ 66.503503][ T6808] ext4_mkdir+0x5e0/0xdf0 [ 66.507814][ T6808] ? ext4_rmdir+0xde0/0xde0 [ 66.512309][ T6808] ? security_inode_permission+0xc4/0xf0 [ 66.518655][ T6808] vfs_mkdir+0x419/0x690 [ 66.522891][ T6808] do_mkdirat+0x21e/0x280 [ 66.527206][ T6808] ? __ia32_sys_mknod+0xb0/0xb0 [ 66.532070][ T6808] ? do_syscall_64+0x1c/0xe0 [ 66.537000][ T6808] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 66.542966][ T6808] do_syscall_64+0x60/0xe0 [ 66.547375][ T6808] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.553245][ T6808] RIP: 0033:0x4b02a0 [ 66.557440][ T6808] Code: Bad RIP value. [ 66.561594][ T6808] RSP: 002b:000000c0000e14b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102 [ 66.570108][ T6808] RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b02a0 [ 66.579054][ T6808] RDX: 00000000000001c0 RSI: 000000c0000cea80 RDI: ffffffffffffff9c [ 66.587010][ T6808] RBP: 000000c0000e1510 R08: 0000000000000000 R09: 0000000000000000 [ 66.594970][ T6808] R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff [ 66.602928][ T6808] R13: 0000000000000055 R14: 0000000000000054 R15: 0000000000000100 [ 66.629376][ T6811] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6811 [ 66.639034][ T6811] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 66.644914][ T6811] CPU: 0 PID: 6811 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 66.653473][ T6811] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.663505][ T6811] Call Trace: [ 66.666789][ T6811] dump_stack+0x18f/0x20d [ 66.671125][ T6811] check_preemption_disabled+0x20d/0x220 [ 66.676744][ T6811] ext4_mb_new_blocks+0xa4d/0x3b70 [ 66.681863][ T6811] ? ext4_ext_search_right+0x2ca/0xb20 [ 66.687299][ T6811] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 66.693017][ T6811] ext4_ext_map_blocks+0x201b/0x33e0 [ 66.698299][ T6811] ? ext4_ext_release+0x10/0x10 [ 66.703156][ T6811] ? down_write_killable+0x170/0x170 [ 66.708448][ T6811] ? ext4_es_lookup_extent+0x41d/0xd10 [ 66.713904][ T6811] ext4_map_blocks+0x4cb/0x1640 [ 66.718751][ T6811] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 66.723941][ T6811] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 66.729467][ T6811] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 66.735650][ T6811] ? prandom_u32_state+0xe/0x170 [ 66.740676][ T6811] ? __brelse+0x84/0xa0 [ 66.744824][ T6811] ? __ext4_new_inode+0x144/0x55e0 [ 66.749916][ T6811] ext4_getblk+0xad/0x520 [ 66.754227][ T6811] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 66.759927][ T6811] ? ext4_free_inode+0x1700/0x1700 [ 66.765020][ T6811] ext4_bread+0x7c/0x380 [ 66.769242][ T6811] ? ext4_getblk+0x520/0x520 [ 66.773821][ T6811] ? dquot_get_next_dqblk+0x180/0x180 [ 66.779187][ T6811] ext4_append+0x153/0x360 [ 66.783585][ T6811] ext4_mkdir+0x5e0/0xdf0 [ 66.787899][ T6811] ? ext4_rmdir+0xde0/0xde0 [ 66.792471][ T6811] ? security_inode_permission+0xc4/0xf0 [ 66.798097][ T6811] vfs_mkdir+0x419/0x690 [ 66.802330][ T6811] do_mkdirat+0x21e/0x280 [ 66.806641][ T6811] ? __ia32_sys_mknod+0xb0/0xb0 [ 66.811482][ T6811] ? do_syscall_64+0x1c/0xe0 [ 66.816050][ T6811] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 66.822011][ T6811] do_syscall_64+0x60/0xe0 [ 66.826416][ T6811] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.832292][ T6811] RIP: 0033:0x45bed7 [ 66.836164][ T6811] Code: Bad RIP value. [ 66.840212][ T6811] RSP: 002b:00007ffd63dba138 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 [ 66.848607][ T6811] RAX: ffffffffffffffda RBX: 000000000003a2f8 RCX: 000000000045bed7 [ 66.856558][ T6811] RDX: 0000000000000002 RSI: 00000000000001c0 RDI: 00007ffd63dba310 [ 66.864511][ T6811] RBP: 0000000000000001 R08: 000000000000f8c0 R09: 0000000000002c40 [ 66.872481][ T6811] R10: 0000000000000011 R11: 0000000000000246 R12: 00000000000000c2 [ 66.880444][ T6811] R13: 00007ffd63dba310 R14: 8421084210842109 R15: 00007ffd63dba31c [ 66.966388][ T6812] IPVS: ftp: loaded support on port[0] = 21 [ 67.003195][ T6812] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6812 [ 67.012653][ T6812] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 67.018772][ T6812] CPU: 1 PID: 6812 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 67.027361][ T6812] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.037406][ T6812] Call Trace: [ 67.040677][ T6812] dump_stack+0x18f/0x20d [ 67.044996][ T6812] check_preemption_disabled+0x20d/0x220 [ 67.050612][ T6812] ext4_mb_new_blocks+0xa4d/0x3b70 [ 67.055708][ T6812] ? ext4_ext_search_right+0x2ca/0xb20 [ 67.061143][ T6812] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 67.067991][ T6812] ext4_ext_map_blocks+0x201b/0x33e0 [ 67.073266][ T6812] ? ext4_ext_release+0x10/0x10 [ 67.078118][ T6812] ? down_write_killable+0x170/0x170 [ 67.083395][ T6812] ? ext4_es_lookup_extent+0x41d/0xd10 [ 67.088845][ T6812] ext4_map_blocks+0x4cb/0x1640 [ 67.094734][ T6812] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 67.099909][ T6812] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 67.105441][ T6812] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 67.111500][ T6812] ? prandom_u32_state+0xe/0x170 [ 67.116433][ T6812] ? __brelse+0x84/0xa0 [ 67.120597][ T6812] ? __ext4_new_inode+0x144/0x55e0 [ 67.125692][ T6812] ext4_getblk+0xad/0x520 [ 67.130004][ T6812] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 67.135710][ T6812] ? ext4_free_inode+0x1700/0x1700 [ 67.140800][ T6812] ext4_bread+0x7c/0x380 [ 67.145030][ T6812] ? ext4_getblk+0x520/0x520 [ 67.149597][ T6812] ? dquot_get_next_dqblk+0x180/0x180 [ 67.154953][ T6812] ext4_append+0x153/0x360 [ 67.159357][ T6812] ext4_mkdir+0x5e0/0xdf0 [ 67.163675][ T6812] ? ext4_rmdir+0xde0/0xde0 [ 67.168159][ T6812] ? security_inode_permission+0xc4/0xf0 [ 67.173781][ T6812] vfs_mkdir+0x419/0x690 [ 67.178008][ T6812] do_mkdirat+0x21e/0x280 [ 67.182324][ T6812] ? __ia32_sys_mknod+0xb0/0xb0 [ 67.187153][ T6812] ? do_syscall_64+0x1c/0xe0 [ 67.191721][ T6812] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 67.197679][ T6812] do_syscall_64+0x60/0xe0 [ 67.202090][ T6812] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 67.207965][ T6812] RIP: 0033:0x45bed7 [ 67.211839][ T6812] Code: Bad RIP value. [ 67.216151][ T6812] RSP: 002b:00007ffd63dba028 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 [ 67.224535][ T6812] RAX: ffffffffffffffda RBX: 000000000078c988 RCX: 000000000045bed7 [ 67.232493][ T6812] RDX: 00007ffd63dba073 RSI: 00000000000001ff RDI: 00007ffd63dba070 [ 67.240440][ T6812] RBP: 00000000000000f8 R08: 0000000000000000 R09: 0000000000000003 [ 67.248484][ T6812] R10: 0000000000000064 R11: 0000000000000206 R12: 00000000004185c0 [ 67.256429][ T6812] R13: 00007ffd63dba060 R14: 0000000000000000 R15: 00007ffd63dba070 [ 67.308201][ T6812] BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/6812 [ 67.317672][ T6812] caller is ext4_mb_new_blocks+0xa4d/0x3b70 [ 67.323588][ T6812] CPU: 0 PID: 6812 Comm: syz-executor.0 Not tainted 5.8.0-rc1-syzkaller #0 [ 67.332258][ T6812] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.342341][ T6812] Call Trace: [ 67.345679][ T6812] dump_stack+0x18f/0x20d [ 67.350030][ T6812] check_preemption_disabled+0x20d/0x220 [ 67.355677][ T6812] ext4_mb_new_blocks+0xa4d/0x3b70 [ 67.360812][ T6812] ? ext4_ext_search_right+0x2ca/0xb20 [ 67.366973][ T6812] ? ext4_inode_to_goal_block+0x2df/0x3f0 [ 67.372734][ T6812] ext4_ext_map_blocks+0x201b/0x33e0 [ 67.378038][ T6812] ? ext4_ext_release+0x10/0x10 [ 67.382922][ T6812] ? down_write_killable+0x170/0x170 [ 67.388379][ T6812] ? ext4_es_lookup_extent+0x41d/0xd10 [ 67.393835][ T6812] ext4_map_blocks+0x4cb/0x1640 [ 67.398700][ T6812] ? ext4_issue_zeroout+0x1e0/0x1e0 [ 67.403899][ T6812] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 67.409450][ T6812] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 67.415455][ T6812] ? prandom_u32_state+0xe/0x170 [ 67.420396][ T6812] ? __brelse+0x84/0xa0 [ 67.424623][ T6812] ? __ext4_new_inode+0x144/0x55e0 [ 67.429776][ T6812] ext4_getblk+0xad/0x520 [ 67.434237][ T6812] ? ext4_iomap_overwrite_begin+0xa0/0xa0 [ 67.439977][ T6812] ? ext4_free_inode+0x1700/0x1700 [ 67.445091][ T6812] ext4_bread+0x7c/0x380 [ 67.449317][ T6812] ? ext4_getblk+0x520/0x520 [ 67.453889][ T6812] ? dquot_get_next_dqblk+0x180/0x180 [ 67.459246][ T6812] ext4_append+0x153/0x360 [ 67.463655][ T6812] ext4_mkdir+0x5e0/0xdf0 [ 67.467978][ T6812] ? ext4_rmdir+0xde0/0xde0 [ 67.472461][ T6812] ? security_inode_permission+0xc4/0xf0 [ 67.478431][ T6812] vfs_mkdir+0x419/0x690 [ 67.482652][ T6812] do_mkdirat+0x21e/0x280 [ 67.486961][ T6812] ? __ia32_sys_mknod+0xb0/0xb0 [ 67.491790][ T6812] ? do_syscall_64+0x1c/0xe0 [ 67.496377][ T6812] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 67.502337][ T6812] do_syscall_64+0x60/0xe0 [ 67.506739][ T6812] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 67.512616][ T6812] RIP: 0033:0x45bed7 [ 67.516488][ T6812] Code: Bad RIP value. [ 67.520542][ T6812] RSP: 002b:00007ffd63dba028 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 [ 67.528927][ T6812] RAX: ffffffffffffffda RBX: 00000000000106da RCX: 000000000045bed7 [ 67.536883][ T6812] RDX: 00007ffd63dba073 RSI: 00000000000001ff RDI: 00007ffd63dba070 [ 67.544842][ T6812] RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000003 2020/06/16 18:03:31 building call list... [ 67.552800][ T6812] R10: 0000000000000064 R11: 0000000000000206 R12: 0000000000000003 [ 67.560765][ T6812] R13: 00007ffd63dba060 R14: 00000000000106cb R15: 00007ffd63dba070 [ 67.825827][ T4284] tipc: TX() has been purged, node left! [ 68.338220][ T4284] ================================================================== [ 68.346493][ T4284] BUG: KASAN: use-after-free in afs_wake_up_async_call+0x6aa/0x770 [ 68.354383][ T4284] Write of size 1 at addr ffff88808cb949e4 by task kworker/u4:8/4284 [ 68.362443][ T4284] [ 68.364777][ T4284] CPU: 1 PID: 4284 Comm: kworker/u4:8 Not tainted 5.8.0-rc1-syzkaller #0 [ 68.373177][ T4284] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.383246][ T4284] Workqueue: netns cleanup_net [ 68.387998][ T4284] Call Trace: [ 68.391289][ T4284] dump_stack+0x18f/0x20d [ 68.395619][ T4284] ? afs_wake_up_async_call+0x6aa/0x770 [ 68.402807][ T4284] ? afs_wake_up_async_call+0x6aa/0x770 [ 68.408347][ T4284] ? afs_put_call+0xa40/0xa40 [ 68.413021][ T4284] print_address_description.constprop.0.cold+0xd3/0x413 [ 68.420054][ T4284] ? vprintk_func+0x97/0x1a6 [ 68.424650][ T4284] ? afs_wake_up_async_call+0x6aa/0x770 [ 68.430195][ T4284] kasan_report.cold+0x1f/0x37 [ 68.434962][ T4284] ? rcu_read_lock_held_common+0x51/0xa0 [ 68.440592][ T4284] ? afs_wake_up_async_call+0x6aa/0x770 [ 68.446137][ T4284] afs_wake_up_async_call+0x6aa/0x770 [ 68.451504][ T4284] ? afs_close_socket+0x320/0x320 [ 68.456526][ T4284] ? afs_put_call+0xa40/0xa40 [ 68.461200][ T4284] rxrpc_notify_socket+0x1db/0x5d0 [ 68.466312][ T4284] ? afs_put_call+0xa40/0xa40 [ 68.470987][ T4284] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 68.477576][ T4284] rxrpc_call_completed+0xca/0xf0 [ 68.482603][ T4284] rxrpc_discard_prealloc+0x781/0xab0 [ 68.487977][ T4284] ? lock_sock_nested+0x94/0x110 [ 68.493003][ T4284] rxrpc_listen+0x147/0x360 [ 68.497512][ T4284] afs_close_socket+0x95/0x320 [ 68.502274][ T4284] ? afs_purge_servers+0x16d/0x300 [ 68.507383][ T4284] ? afs_rx_discard_new_call+0x50/0x50 [ 68.512844][ T4284] ? init_wait_var_entry+0x200/0x200 [ 68.518145][ T4284] ? rcu_read_lock_held_common+0xa0/0xa0 [ 68.523789][ T4284] ? check_preemption_disabled+0x38/0x220 [ 68.529520][ T4284] afs_net_exit+0x1bc/0x310 [ 68.534037][ T4284] ? afs_net_init+0xe30/0xe30 [ 68.538712][ T4284] ops_exit_list.isra.0+0xa8/0x150 [ 68.543829][ T4284] cleanup_net+0x511/0xa50 [ 68.548250][ T4284] ? unregister_pernet_device+0x70/0x70 [ 68.553798][ T4284] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 68.559788][ T4284] process_one_work+0x965/0x1690 [ 68.564923][ T4284] ? lock_release+0x800/0x800 [ 68.569630][ T4284] ? pwq_dec_nr_in_flight+0x310/0x310 [ 68.575043][ T4284] ? rwlock_bug.part.0+0x90/0x90 [ 68.580002][ T4284] worker_thread+0x96/0xe10 [ 68.584554][ T4284] ? process_one_work+0x1690/0x1690 [ 68.589753][ T4284] kthread+0x3b5/0x4a0 [ 68.593847][ T4284] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 68.599562][ T4284] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 68.605283][ T4284] ret_from_fork+0x1f/0x30 [ 68.609714][ T4284] [ 68.612037][ T4284] Allocated by task 6812: [ 68.616363][ T4284] save_stack+0x1b/0x40 [ 68.620516][ T4284] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 68.626146][ T4284] kmem_cache_alloc_trace+0x153/0x7d0 [ 68.631513][ T4284] afs_alloc_call+0x55/0x630 [ 68.636617][ T4284] afs_charge_preallocation+0xe9/0x2d0 [ 68.642066][ T4284] afs_open_socket+0x292/0x360 [ 68.646827][ T4284] afs_net_init+0xa6c/0xe30 [ 68.651329][ T4284] ops_init+0xaf/0x420 [ 68.655390][ T4284] setup_net+0x2de/0x860 [ 68.659629][ T4284] copy_net_ns+0x293/0x590 [ 68.664940][ T4284] create_new_namespaces+0x3fb/0xb30 [ 68.670239][ T4284] unshare_nsproxy_namespaces+0xbd/0x1f0 [ 68.675884][ T4284] ksys_unshare+0x43d/0x8e0 [ 68.680397][ T4284] __x64_sys_unshare+0x2d/0x40 [ 68.685433][ T4284] do_syscall_64+0x60/0xe0 [ 68.689852][ T4284] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 68.695729][ T4284] [ 68.698049][ T4284] Freed by task 4284: [ 68.702024][ T4284] save_stack+0x1b/0x40 [ 68.706173][ T4284] __kasan_slab_free+0xf7/0x140 [ 68.711365][ T4284] kfree+0x109/0x2b0 [ 68.715258][ T4284] afs_put_call+0x585/0xa40 [ 68.719759][ T4284] rxrpc_discard_prealloc+0x764/0xab0 [ 68.725124][ T4284] rxrpc_listen+0x147/0x360 [ 68.729632][ T4284] afs_close_socket+0x95/0x320 [ 68.734394][ T4284] afs_net_exit+0x1bc/0x310 [ 68.738894][ T4284] ops_exit_list.isra.0+0xa8/0x150 [ 68.744092][ T4284] cleanup_net+0x511/0xa50 [ 68.748509][ T4284] process_one_work+0x965/0x1690 [ 68.753442][ T4284] worker_thread+0x96/0xe10 [ 68.757939][ T4284] kthread+0x3b5/0x4a0 [ 68.762004][ T4284] ret_from_fork+0x1f/0x30 [ 68.766405][ T4284] [ 68.768730][ T4284] The buggy address belongs to the object at ffff88808cb94800 [ 68.768730][ T4284] which belongs to the cache kmalloc-1k of size 1024 [ 68.782777][ T4284] The buggy address is located 484 bytes inside of [ 68.782777][ T4284] 1024-byte region [ffff88808cb94800, ffff88808cb94c00) [ 68.796126][ T4284] The buggy address belongs to the page: [ 68.801755][ T4284] page:ffffea000232e500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 68.810849][ T4284] flags: 0xfffe0000000200(slab) [ 68.815698][ T4284] raw: 00fffe0000000200 ffffea0002683b48 ffffea000232dd08 ffff8880aa000c40 [ 68.824279][ T4284] raw: 0000000000000000 ffff88808cb94000 0000000100000002 0000000000000000 [ 68.832848][ T4284] page dumped because: kasan: bad access detected [ 68.839243][ T4284] [ 68.841562][ T4284] Memory state around the buggy address: [ 68.847188][ T4284] ffff88808cb94880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.855243][ T4284] ffff88808cb94900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.863643][ T4284] >ffff88808cb94980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.871787][ T4284] ^ [ 68.878976][ T4284] ffff88808cb94a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.887204][ T4284] ffff88808cb94a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.895254][ T4284] ================================================================== [ 68.903302][ T4284] Disabling lock debugging due to kernel taint [ 68.909495][ T4284] Kernel panic - not syncing: panic_on_warn set ... [ 68.916164][ T4284] CPU: 1 PID: 4284 Comm: kworker/u4:8 Tainted: G B 5.8.0-rc1-syzkaller #0 [ 68.925994][ T4284] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.936052][ T4284] Workqueue: netns cleanup_net [ 68.940811][ T4284] Call Trace: [ 68.944131][ T4284] dump_stack+0x18f/0x20d [ 68.948462][ T4284] ? afs_wake_up_async_call+0x670/0x770 [ 68.954007][ T4284] ? afs_put_call+0xa40/0xa40 [ 68.958679][ T4284] panic+0x2e3/0x75c [ 68.962570][ T4284] ? __warn_printk+0xf3/0xf3 [ 68.967159][ T4284] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 68.973337][ T4284] ? trace_hardirqs_on+0x55/0x220 [ 68.978360][ T4284] ? afs_wake_up_async_call+0x6aa/0x770 [ 68.983896][ T4284] ? afs_wake_up_async_call+0x6aa/0x770 [ 68.989444][ T4284] ? afs_put_call+0xa40/0xa40 [ 68.994111][ T4284] end_report+0x4d/0x53 [ 68.998251][ T4284] kasan_report.cold+0xd/0x37 [ 69.002990][ T4284] ? rcu_read_lock_held_common+0x51/0xa0 [ 69.008814][ T4284] ? afs_wake_up_async_call+0x6aa/0x770 [ 69.014365][ T4284] afs_wake_up_async_call+0x6aa/0x770 [ 69.019894][ T4284] ? afs_close_socket+0x320/0x320 [ 69.024915][ T4284] ? afs_put_call+0xa40/0xa40 [ 69.029589][ T4284] rxrpc_notify_socket+0x1db/0x5d0 [ 69.034695][ T4284] ? afs_put_call+0xa40/0xa40 [ 69.039349][ T4284] __rxrpc_set_call_completion.part.0+0x172/0x410 [ 69.045853][ T4284] rxrpc_call_completed+0xca/0xf0 [ 69.050870][ T4284] rxrpc_discard_prealloc+0x781/0xab0 [ 69.056239][ T4284] ? lock_sock_nested+0x94/0x110 [ 69.061172][ T4284] rxrpc_listen+0x147/0x360 [ 69.065676][ T4284] afs_close_socket+0x95/0x320 [ 69.070418][ T4284] ? afs_purge_servers+0x16d/0x300 [ 69.075508][ T4284] ? afs_rx_discard_new_call+0x50/0x50 [ 69.080953][ T4284] ? init_wait_var_entry+0x200/0x200 [ 69.086223][ T4284] ? rcu_read_lock_held_common+0xa0/0xa0 [ 69.091845][ T4284] ? check_preemption_disabled+0x38/0x220 [ 69.097548][ T4284] afs_net_exit+0x1bc/0x310 [ 69.102042][ T4284] ? afs_net_init+0xe30/0xe30 [ 69.106717][ T4284] ops_exit_list.isra.0+0xa8/0x150 [ 69.111821][ T4284] cleanup_net+0x511/0xa50 [ 69.116232][ T4284] ? unregister_pernet_device+0x70/0x70 [ 69.121785][ T4284] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 69.127773][ T4284] process_one_work+0x965/0x1690 [ 69.132727][ T4284] ? lock_release+0x800/0x800 [ 69.137395][ T4284] ? pwq_dec_nr_in_flight+0x310/0x310 [ 69.142755][ T4284] ? rwlock_bug.part.0+0x90/0x90 [ 69.147695][ T4284] worker_thread+0x96/0xe10 [ 69.152193][ T4284] ? process_one_work+0x1690/0x1690 [ 69.157380][ T4284] kthread+0x3b5/0x4a0 [ 69.161434][ T4284] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 69.167132][ T4284] ? kthread_mod_delayed_work+0x1a0/0x1a0 [ 69.172837][ T4284] ret_from_fork+0x1f/0x30 [ 69.178633][ T4284] Kernel Offset: disabled [ 69.182948][ T4284] Rebooting in 86400 seconds..