audit: type=1400 audit(1664506382.715:8): avc: denied { kernel } for pid=4115 comm="syz-executor.1" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 ------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected 6.0.0-rc7-next-20220929 #1 Not tainted ------------------------------------------------------ syz-executor.1/4117 is trying to acquire lock: ffffffff853faab8 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70 but task is already holding lock: ffff88803f4ec020 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ctx->lock){....}-{2:2}: _raw_spin_lock+0x2a/0x40 __perf_event_task_sched_out+0x53b/0x18d0 __schedule+0xedd/0x2470 schedule+0xda/0x1b0 exit_to_user_mode_prepare+0x114/0x1a0 syscall_exit_to_user_mode+0x19/0x40 do_syscall_64+0x48/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #2 (&rq->__lock){-.-.}-{2:2}: _raw_spin_lock_nested+0x30/0x40 raw_spin_rq_lock_nested+0x1e/0x30 task_fork_fair+0x63/0x4d0 sched_cgroup_fork+0x3d0/0x540 copy_process+0x4183/0x6e20 kernel_clone+0xe7/0x890 user_mode_thread+0xad/0xf0 rest_init+0x24/0x250 arch_call_rest_init+0xf/0x14 start_kernel+0x4c6/0x4eb secondary_startup_64_no_verify+0xe0/0xeb -> #1 (&p->pi_lock){-.-.}-{2:2}: _raw_spin_lock_irqsave+0x39/0x60 try_to_wake_up+0xab/0x1930 up+0x75/0xb0 __up_console_sem+0x6e/0x80 console_unlock+0x46a/0x590 vprintk_emit+0x1bd/0x560 vprintk+0x84/0xa0 _printk+0xba/0xf1 kauditd_hold_skb.cold+0x3f/0x4e kauditd_send_queue+0x233/0x290 kauditd_thread+0x5f9/0x9c0 kthread+0x2ed/0x3a0 ret_from_fork+0x22/0x30 -> #0 ((console_sem).lock){....}-{2:2}: __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a2/0x530 _raw_spin_lock_irqsave+0x39/0x60 down_trylock+0xe/0x70 __down_trylock_console_sem+0x3b/0xd0 vprintk_emit+0x16b/0x560 vprintk+0x84/0xa0 _printk+0xba/0xf1 report_bug.cold+0x72/0xab handle_bug+0x3c/0x70 exc_invalid_op+0x14/0x50 asm_exc_invalid_op+0x16/0x20 group_sched_out.part.0+0x2c7/0x460 ctx_sched_out+0x8f1/0xc10 __perf_event_task_sched_out+0x6d0/0x18d0 __schedule+0xedd/0x2470 schedule+0xda/0x1b0 exit_to_user_mode_prepare+0x114/0x1a0 syscall_exit_to_user_mode+0x19/0x40 do_syscall_64+0x48/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: (console_sem).lock --> &rq->__lock --> &ctx->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ctx->lock); lock(&rq->__lock); lock(&ctx->lock); lock((console_sem).lock); *** DEADLOCK *** 2 locks held by syz-executor.1/4117: #0: ffff88806cf37e98 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470 #1: ffff88803f4ec020 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0 stack backtrace: CPU: 1 PID: 4117 Comm: syz-executor.1 Not tainted 6.0.0-rc7-next-20220929 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 check_noncircular+0x263/0x2e0 __lock_acquire+0x2a02/0x5e70 lock_acquire+0x1a2/0x530 _raw_spin_lock_irqsave+0x39/0x60 down_trylock+0xe/0x70 __down_trylock_console_sem+0x3b/0xd0 vprintk_emit+0x16b/0x560 vprintk+0x84/0xa0 _printk+0xba/0xf1 report_bug.cold+0x72/0xab handle_bug+0x3c/0x70 exc_invalid_op+0x14/0x50 asm_exc_invalid_op+0x16/0x20 RIP: 0010:group_sched_out.part.0+0x2c7/0x460 Code: 5e 41 5f e9 8b ae ef ff e8 86 ae ef ff 65 8b 1d 6b 17 ac 7e 31 ff 89 de e8 26 ab ef ff 85 db 0f 84 8a 00 00 00 e8 69 ae ef ff <0f> 0b e9 a5 fe ff ff e8 5d ae ef ff 48 8d 7d 10 48 b8 00 00 00 00 RSP: 0018:ffff88803fcbfc48 EFLAGS: 00010006 RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888040d99ac0 RSI: ffffffff81565e67 RDI: 0000000000000005 RBP: ffff88803f968000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88803f4ec000 R13: ffff88806cf3d2c0 R14: ffffffff8547c9a0 R15: 0000000000000002 ctx_sched_out+0x8f1/0xc10 __perf_event_task_sched_out+0x6d0/0x18d0 __schedule+0xedd/0x2470 schedule+0xda/0x1b0 exit_to_user_mode_prepare+0x114/0x1a0 syscall_exit_to_user_mode+0x19/0x40 do_syscall_64+0x48/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb3f12c9b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb3ee83f218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007fb3f13dcf68 RCX: 00007fb3f12c9b19 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fb3f13dcf6c RBP: 00007fb3f13dcf60 R08: 000000000000000e R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 00007fb3f13dcf6c R13: 00007ffefe2eb8cf R14: 00007fb3ee83f300 R15: 0000000000022000 WARNING: CPU: 1 PID: 4117 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460 Modules linked in: CPU: 1 PID: 4117 Comm: syz-executor.1 Not tainted 6.0.0-rc7-next-20220929 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 RIP: 0010:group_sched_out.part.0+0x2c7/0x460 Code: 5e 41 5f e9 8b ae ef ff e8 86 ae ef ff 65 8b 1d 6b 17 ac 7e 31 ff 89 de e8 26 ab ef ff 85 db 0f 84 8a 00 00 00 e8 69 ae ef ff <0f> 0b e9 a5 fe ff ff e8 5d ae ef ff 48 8d 7d 10 48 b8 00 00 00 00 RSP: 0018:ffff88803fcbfc48 EFLAGS: 00010006 RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888040d99ac0 RSI: ffffffff81565e67 RDI: 0000000000000005 RBP: ffff88803f968000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88803f4ec000 R13: ffff88806cf3d2c0 R14: ffffffff8547c9a0 R15: 0000000000000002 FS: 00007fb3ee83f700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555555af0c58 CR3: 000000000d792000 CR4: 0000000000350ee0 Call Trace: ctx_sched_out+0x8f1/0xc10 __perf_event_task_sched_out+0x6d0/0x18d0 __schedule+0xedd/0x2470 schedule+0xda/0x1b0 exit_to_user_mode_prepare+0x114/0x1a0 syscall_exit_to_user_mode+0x19/0x40 do_syscall_64+0x48/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb3f12c9b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb3ee83f218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007fb3f13dcf68 RCX: 00007fb3f12c9b19 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fb3f13dcf6c RBP: 00007fb3f13dcf60 R08: 000000000000000e R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 00007fb3f13dcf6c R13: 00007ffefe2eb8cf R14: 00007fb3ee83f300 R15: 0000000000022000 irq event stamp: 3590 hardirqs last enabled at (3589): [] exit_to_user_mode_prepare+0x109/0x1a0 hardirqs last disabled at (3590): [] __schedule+0x1225/0x2470 softirqs last enabled at (3434): [] __irq_exit_rcu+0x11b/0x180 softirqs last disabled at (3429): [] __irq_exit_rcu+0x11b/0x180 ---[ end trace 0000000000000000 ]--- cgroup: Need name or subsystem set cgroup: Need name or subsystem set cgroup: Need name or subsystem set loop0: detected capacity change from 0 to 264192 loop1: detected capacity change from 0 to 264192 loop3: detected capacity change from 0 to 264192 loop6: detected capacity change from 0 to 264192 hrtimer: interrupt took 14497 ns loop2: detected capacity change from 0 to 264192 loop4: detected capacity change from 0 to 264192 loop1: detected capacity change from 0 to 264192 loop3: detected capacity change from 0 to 264192 loop5: detected capacity change from 0 to 264192 loop0: detected capacity change from 0 to 264192 loop6: detected capacity change from 0 to 264192 loop0: detected capacity change from 0 to 264192 loop6: detected capacity change from 0 to 264192 loop3: detected capacity change from 0 to 264192 loop1: detected capacity change from 0 to 264192 loop5: detected capacity change from 0 to 264192 loop4: detected capacity change from 0 to 264192 loop2: detected capacity change from 0 to 264192 loop1: detected capacity change from 0 to 4096 loop4: detected capacity change from 0 to 264192 loop5: detected capacity change from 0 to 264192 Quota error (device loop1): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop1): ext4_enable_quotas:6809: Failed to enable quota tracking (type=1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed loop2: detected capacity change from 0 to 264192 loop1: detected capacity change from 0 to 4096 Quota error (device loop1): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop1): ext4_enable_quotas:6809: Failed to enable quota tracking (type=1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed loop1: detected capacity change from 0 to 4096 Quota error (device loop1): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop1): ext4_enable_quotas:6809: Failed to enable quota tracking (type=1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed loop1: detected capacity change from 0 to 4096 Quota error (device loop1): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop1): ext4_enable_quotas:6809: Failed to enable quota tracking (type=1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed loop1: detected capacity change from 0 to 4096 Quota error (device loop1): v2_read_file_info: Free block number too big (0 >= 0). EXT4-fs warning (device loop1): ext4_enable_quotas:6809: Failed to enable quota tracking (type=1, err=-117). Please run e2fsck to fix. EXT4-fs (loop1): mount failed loop1: detected capacity change from 0 to 1024 EXT4-fs (loop1): mounted filesystem without journal. Quota mode: none. EXT4-fs (loop1): unmounting filesystem. loop1: detected capacity change from 0 to 1024 EXT4-fs (loop1): mounted filesystem without journal. Quota mode: none. EXT4-fs (loop1): unmounting filesystem. loop1: detected capacity change from 0 to 1024 EXT4-fs (loop1): mounted filesystem without journal. Quota mode: none. EXT4-fs (loop1): unmounting filesystem. loop1: detected capacity change from 0 to 1024 loop7: detected capacity change from 0 to 1024 EXT4-fs (loop1): mounted filesystem without journal. Quota mode: none. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback. EXT4-fs (loop7): unmounting filesystem. loop7: detected capacity change from 0 to 608 SELinux: Context system_u:object is not valid (left unmapped). loop2: detected capacity change from 0 to 352 loop7: detected capacity change from 0 to 512 EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir742575457/syzkaller.QN8cei/51/file0 supports timestamps until 2038 (0x7fffffff) EXT4-fs (loop7): unmounting filesystem. loop7: detected capacity change from 0 to 512 EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir742575457/syzkaller.QN8cei/52/file0 supports timestamps until 2038 (0x7fffffff) EXT4-fs (loop7): unmounting filesystem. loop7: detected capacity change from 0 to 512 EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir742575457/syzkaller.QN8cei/53/file0 supports timestamps until 2038 (0x7fffffff) EXT4-fs (loop7): unmounting filesystem. loop7: detected capacity change from 0 to 512 EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir742575457/syzkaller.QN8cei/54/file0 supports timestamps until 2038 (0x7fffffff) EXT4-fs (loop7): unmounting filesystem. audit: type=1400 audit(1664506390.735:9): avc: denied { relabelto } for pid=4829 comm="syz-executor.7" name="UDPv6" dev="sockfs" ino=16604 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:selinux_config_t:s0 tclass=udp_socket permissive=1 loop0: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' audit: type=1400 audit(1664506390.913:10): avc: denied { write } for pid=4848 comm="syz-executor.4" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 loop0: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop0: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop6: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop0: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop6: detected capacity change from 0 to 57 loop0: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop2: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop7: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop4: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop2: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop6: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop7: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop4: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop7: detected capacity change from 0 to 57 loop2: detected capacity change from 0 to 57 EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' EXT4-fs: Ignoring removed nomblk_io_submit option ext4: Unknown parameter 'euid>00000000000000000000' loop4: detected capacity change from 0 to 57 audit: type=1326 audit(1664506392.657:11): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4965 comm="syz-executor.1" exe="/syz-executor.1" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fb3f12c9b19 code=0x0 audit: type=1400 audit(1664506392.684:12): avc: denied { create } for pid=4967 comm="syz-executor.6" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:sendmail_exec_t:s0 tclass=key permissive=1