Hello, syzbot found the following issue on: HEAD commit: 6441998e2e37 Merge tag 'audit-pr-20211216' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12b88443b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=fa556098924b78f0 dashboard link: https://syzkaller.appspot.com/bug?extid=72c5cf124089bc318016 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160d179db00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17741243b00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+72c5cf124089bc318016@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor149:3707 blocked for more than 143 seconds. Not tainted 5.16.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor149 state:D stack:23928 pid: 3707 ppid: 3685 flags:0x00000000 Call Trace: <TASK> context_switch kernel/sched/core.c:4972 [inline] context_switch kernel/sched/core.c:4972 [inline] kernel/sched/core.c:6253 __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 kernel/sched/core.c:6326 rwsem_down_write_slowpath+0x634/0x1110 kernel/locking/rwsem.c:1151 kernel/locking/rwsem.c:1151 __down_write_common kernel/locking/rwsem.c:1268 [inline] __down_write_common kernel/locking/rwsem.c:1265 [inline] __down_write kernel/locking/rwsem.c:1277 [inline] __down_write_common kernel/locking/rwsem.c:1268 [inline] kernel/locking/rwsem.c:1634 __down_write_common kernel/locking/rwsem.c:1265 [inline] kernel/locking/rwsem.c:1634 __down_write kernel/locking/rwsem.c:1277 [inline] kernel/locking/rwsem.c:1634 down_write_nested+0x139/0x150 kernel/locking/rwsem.c:1634 kernel/locking/rwsem.c:1634 inode_lock_nested include/linux/fs.h:818 [inline] inode_lock_nested include/linux/fs.h:818 [inline] fs/namei.c:3654 filename_create+0x158/0x480 fs/namei.c:3654 fs/namei.c:3654 do_mkdirat+0x94/0x300 fs/namei.c:3898 fs/namei.c:3898 __do_sys_mkdir fs/namei.c:3929 [inline] __se_sys_mkdir fs/namei.c:3927 [inline] __do_sys_mkdir fs/namei.c:3929 [inline] fs/namei.c:3927 __se_sys_mkdir fs/namei.c:3927 [inline] fs/namei.c:3927 __x64_sys_mkdir+0xf2/0x140 fs/namei.c:3927 fs/namei.c:3927 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f8e02ef3b47 RSP: 002b:00007f8e03098ca8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8e02ef3b47 RDX: 00007f8e03098cf3 RSI: 00000000000001ff RDI: 00007f8e03098ce0 RBP: 00007f8e03098ee0 R08: 0000000000000000 R09: 00007f8e03098b40 R10: 00007f8e030989f7 R11: 0000000000000202 R12: 0000000000000001 R13: 00007f8e03098ce0 R14: 00007f8e03098d20 R15: 00007f8e03098ef0 </TASK> INFO: task syz-executor149:3711 blocked for more than 143 seconds. Not tainted 5.16.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor149 state:D stack:23928 pid: 3711 ppid: 3681 flags:0x00000000 Call Trace: <TASK> context_switch kernel/sched/core.c:4972 [inline] context_switch kernel/sched/core.c:4972 [inline] kernel/sched/core.c:6253 __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 kernel/sched/core.c:6326 rwsem_down_write_slowpath+0x634/0x1110 kernel/locking/rwsem.c:1151 kernel/locking/rwsem.c:1151 __down_write_common kernel/locking/rwsem.c:1268 [inline] __down_write_common kernel/locking/rwsem.c:1265 [inline] __down_write kernel/locking/rwsem.c:1277 [inline] __down_write_common kernel/locking/rwsem.c:1268 [inline] kernel/locking/rwsem.c:1634 __down_write_common kernel/locking/rwsem.c:1265 [inline] kernel/locking/rwsem.c:1634 __down_write kernel/locking/rwsem.c:1277 [inline] kernel/locking/rwsem.c:1634 down_write_nested+0x139/0x150 kernel/locking/rwsem.c:1634 kernel/locking/rwsem.c:1634 inode_lock_nested include/linux/fs.h:818 [inline] inode_lock_nested include/linux/fs.h:818 [inline] fs/namei.c:3654 filename_create+0x158/0x480 fs/namei.c:3654 fs/namei.c:3654 do_mkdirat+0x94/0x300 fs/namei.c:3898 fs/namei.c:3898 __do_sys_mkdir fs/namei.c:3929 [inline] __se_sys_mkdir fs/namei.c:3927 [inline] __do_sys_mkdir fs/namei.c:3929 [inline] fs/namei.c:3927 __se_sys_mkdir fs/namei.c:3927 [inline] fs/namei.c:3927 __x64_sys_mkdir+0xf2/0x140 fs/namei.c:3927 fs/namei.c:3927 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_x64 arch/x86/entry/common.c:50 [inline] arch/x86/entry/common.c:80 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f8e02ef3b47 RSP: 002b:00007f8e03098ca8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8e02ef3b47 RDX: 00007f8e03098cf3 RSI: 00000000000001ff RDI: 00007f8e03098ce0 RBP: 00007f8e03098ee0 R08: 0000000000000000 R09: 00007f8e03098b40 R10: 00007f8e030989f7 R11: 0000000000000202 R12: 0000000000000001 R13: 00007f8e03098ce0 R14: 00007f8e03098d20 R15: 00007f8e03098ef0 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8bb83de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 kernel/locking/lockdep.c:6458 2 locks held by kworker/u4:4/995: #0: ffff8880b9c39a98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478 kernel/sched/core.c:478 #1: ffff8880b9c279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a6/0x490 kernel/sched/psi.c:880 kernel/sched/psi.c:880 2 locks held by kworker/1:3/3266: #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] kernel/workqueue.c:2269 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] kernel/workqueue.c:2269 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] kernel/workqueue.c:2269 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:635 [inline] kernel/workqueue.c:2269 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:662 [inline] kernel/workqueue.c:2269 #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2269 kernel/workqueue.c:2269 #1: ffffc90001a6fdb0 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:2273 kernel/workqueue.c:2273 2 locks held by getty/3279: #0: ffff8880231c5098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 drivers/tty/tty_ldisc.c:252 #1: ffffc90002b962e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 drivers/tty/n_tty.c:2113 1 lock held by syz-executor149/3706: #0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] #0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] kernel/rcu/tree_exp.h:836 #0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d5/0x620 kernel/rcu/tree_exp.h:836 kernel/rcu/tree_exp.h:836 2 locks held by syz-executor149/3707: #0: ffff88801f07a460 (sb_writers#11){.+.+}-{0:0}, at: filename_create+0xf3/0x480 fs/namei.c:3649 fs/namei.c:3649 #1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline] #1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline] fs/namei.c:3654 #1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: filename_create+0x158/0x480 fs/namei.c:3654 fs/namei.c:3654 1 lock held by syz-executor149/3708: #0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] #0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] kernel/rcu/tree_exp.h:836 #0: ffffffff8bb8d168 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d5/0x620 kernel/rcu/tree_exp.h:836 kernel/rcu/tree_exp.h:836 2 locks held by syz-executor149/3709: #0: ffff88801f07a460 (sb_writers#11){.+.+}-{0:0}, at: filename_create+0xf3/0x480 fs/namei.c:3649 fs/namei.c:3649 #1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline] #1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline] fs/namei.c:3654 #1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: filename_create+0x158/0x480 fs/namei.c:3654 fs/namei.c:3654 2 locks held by syz-executor149/3711: #0: ffff88801f07a460 (sb_writers#11){.+.+}-{0:0}, at: filename_create+0xf3/0x480 fs/namei.c:3649 fs/namei.c:3649 #1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline] #1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:818 [inline] fs/namei.c:3654 #1: ffff88807533e9d0 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: filename_create+0x158/0x480 fs/namei.c:3654 fs/namei.c:3654 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] __dump_stack lib/dump_stack.c:88 [inline] lib/dump_stack.c:106 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] kernel/hung_task.c:295 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] kernel/hung_task.c:295 watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kernel/hung_task.c:295 kthread+0x405/0x4f0 kernel/kthread.c:327 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 arch/x86/entry/entry_64.S:295 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.16.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:validate_chain kernel/locking/lockdep.c:3808 [inline] RIP: 0010:validate_chain kernel/locking/lockdep.c:3808 [inline] kernel/locking/lockdep.c:5027 RIP: 0010:__lock_acquire+0xcaa/0x54a0 kernel/locking/lockdep.c:5027 kernel/locking/lockdep.c:5027 Code: ff df 0f b6 04 02 49 89 cf 84 c0 74 08 3c 03 0f 8e 2b 34 00 00 41 8b 44 24 20 25 00 80 04 00 3d 00 00 04 00 0f 84 5e 09 00 00 <48> c7 c2 8c 6a 91 8d 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f RSP: 0018:ffffc90000cd7a60 EFLAGS: 00000087 RAX: 0000000000000000 RBX: 00000000a623e6fc RCX: eeae28e815dd6c6b RDX: 1ffff110021cec3a RSI: 000000004cd55dcb RDI: ffffffff8ff76c60 RBP: 0000000000000004 R08: 0000000000000000 R09: ffffffff8ff74a07 R10: fffffbfff1fee940 R11: 0000000000000000 R12: ffff888010e761b0 R13: ffff888010e75700 R14: 0000000000000000 R15: eeae28e815dd6c6b FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555555840848 CR3: 000000000b88e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> lock_acquire kernel/locking/lockdep.c:5637 [inline] lock_acquire kernel/locking/lockdep.c:5637 [inline] kernel/locking/lockdep.c:5602 lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602 kernel/locking/lockdep.c:5602 rcu_lock_acquire include/linux/rcupdate.h:268 [inline] rcu_read_lock include/linux/rcupdate.h:688 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline] rcu_lock_acquire include/linux/rcupdate.h:268 [inline] net/batman-adv/network-coding.c:723 rcu_read_lock include/linux/rcupdate.h:688 [inline] net/batman-adv/network-coding.c:723 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline] net/batman-adv/network-coding.c:723 batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:723 net/batman-adv/network-coding.c:723 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 arch/x86/entry/entry_64.S:295 </TASK> ---------------- Code disassembly (best guess), 1 bytes skipped: 0: df 0f fisttps (%rdi) 2: b6 04 mov $0x4,%dh 4: 02 49 89 add -0x77(%rcx),%cl 7: cf iret 8: 84 c0 test %al,%al a: 74 08 je 0x14 c: 3c 03 cmp $0x3,%al e: 0f 8e 2b 34 00 00 jle 0x343f 14: 41 8b 44 24 20 mov 0x20(%r12),%eax 19: 25 00 80 04 00 and $0x48000,%eax 1e: 3d 00 00 04 00 cmp $0x40000,%eax 23: 0f 84 5e 09 00 00 je 0x987 * 29: 48 c7 c2 8c 6a 91 8d mov $0xffffffff8d916a8c,%rdx <-- trapping instruction 30: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 37: fc ff df 3a: 48 c1 ea 03 shr $0x3,%rdx 3e: 0f .byte 0xf ---------------- Code disassembly (best guess), 1 bytes skipped: 0: df 0f fisttps (%rdi) 2: b6 04 mov $0x4,%dh 4: 02 49 89 add -0x77(%rcx),%cl 7: cf iret 8: 84 c0 test %al,%al a: 74 08 je 0x14 c: 3c 03 cmp $0x3,%al e: 0f 8e 2b 34 00 00 jle 0x343f 14: 41 8b 44 24 20 mov 0x20(%r12),%eax 19: 25 00 80 04 00 and $0x48000,%eax 1e: 3d 00 00 04 00 cmp $0x40000,%eax 23: 0f 84 5e 09 00 00 je 0x987 * 29: 48 c7 c2 8c 6a 91 8d mov $0xffffffff8d916a8c,%rdx <-- trapping instruction 30: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 37: fc ff df 3a: 48 c1 ea 03 shr $0x3,%rdx 3e: 0f .byte 0xf --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
