audit: type=1400 audit(1663768613.674:8): avc: denied { kernel } for pid=3879 comm="syz-executor.3" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 hrtimer: interrupt took 20108 ns ------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected 6.0.0-rc6-next-20220921 #1 Not tainted ------------------------------------------------------ syz-executor.7/3944 is trying to acquire lock: ffffffff853faab8 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0xe/0x70 but task is already holding lock: ffff88800ef09c20 (&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+0x4c1/0x4e6 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 vt_ioctl+0x14e3/0x2ca0 tty_ioctl+0x7c4/0x1700 __x64_sys_ioctl+0x19a/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #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 irqentry_exit_to_user_mode+0x5/0x30 asm_sysvec_apic_timer_interrupt+0x16/0x20 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.7/3944: #0: ffff88806cf37d18 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470 #1: ffff88800ef09c20 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0 stack backtrace: CPU: 1 PID: 3944 Comm: syz-executor.7 Not tainted 6.0.0-rc6-next-20220921 #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 9b b9 ef ff e8 96 b9 ef ff 65 8b 1d 2b 12 ac 7e 31 ff 89 de e8 36 b6 ef ff 85 db 0f 84 8a 00 00 00 e8 79 b9 ef ff <0f> 0b e9 a5 fe ff ff e8 6d b9 ef ff 48 8d 7d 10 48 b8 00 00 00 00 RSP: 0000:ffff88803f347c68 EFLAGS: 00010006 RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888016290000 RSI: ffffffff815663a7 RDI: 0000000000000005 RBP: ffff88801afc1158 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800ef09c00 R13: ffff88806cf3d140 R14: ffffffff8547d0e0 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 irqentry_exit_to_user_mode+0x5/0x30 asm_sysvec_apic_timer_interrupt+0x16/0x20 RIP: 0033:0x7fe321624b19 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:00007fe31eb9a188 EFLAGS: 00000246 RAX: 0000000000000004 RBX: 00007fe321737f60 RCX: 00007fe321624b19 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000280 RBP: 00007fe32167ef6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff346c817f R14: 00007fe31eb9a300 R15: 0000000000022000 WARNING: CPU: 1 PID: 3944 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460 Modules linked in: CPU: 1 PID: 3944 Comm: syz-executor.7 Not tainted 6.0.0-rc6-next-20220921 #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 9b b9 ef ff e8 96 b9 ef ff 65 8b 1d 2b 12 ac 7e 31 ff 89 de e8 36 b6 ef ff 85 db 0f 84 8a 00 00 00 e8 79 b9 ef ff <0f> 0b e9 a5 fe ff ff e8 6d b9 ef ff 48 8d 7d 10 48 b8 00 00 00 00 RSP: 0000:ffff88803f347c68 EFLAGS: 00010006 RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888016290000 RSI: ffffffff815663a7 RDI: 0000000000000005 RBP: ffff88801afc1158 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800ef09c00 R13: ffff88806cf3d140 R14: ffffffff8547d0e0 R15: 0000000000000002 FS: 00007fe31eb9a700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe321738018 CR3: 000000004083a000 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 irqentry_exit_to_user_mode+0x5/0x30 asm_sysvec_apic_timer_interrupt+0x16/0x20 RIP: 0033:0x7fe321624b19 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:00007fe31eb9a188 EFLAGS: 00000246 RAX: 0000000000000004 RBX: 00007fe321737f60 RCX: 00007fe321624b19 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000280 RBP: 00007fe32167ef6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff346c817f R14: 00007fe31eb9a300 R15: 0000000000022000 irq event stamp: 512 hardirqs last enabled at (511): [] asm_sysvec_apic_timer_interrupt+0x16/0x20 hardirqs last disabled at (512): [] __schedule+0x1225/0x2470 softirqs last enabled at (506): [] __irq_exit_rcu+0x11b/0x180 softirqs last disabled at (449): [] __irq_exit_rcu+0x11b/0x180 ---[ end trace 0000000000000000 ]--- audit: type=1400 audit(1663768614.780:9): avc: denied { write } for pid=3943 comm="syz-executor.7" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 cgroup: Unknown subsys name 'dont_measure' cgroup: Unknown subsys name 'dont_measure' cgroup: Unknown subsys name 'dont_measure' cgroup: Unknown subsys name 'dont_measure' cgroup: Unknown subsys name 'dont_measure' sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 CDB: Read CD msf sr 1:0:0:0: [sr0] tag#0 CDB[00]: b9 20 88 8e 8c 6f 16 ee e0 ed 40 13 e6 8f d6 79 sr 1:0:0:0: [sr0] tag#0 CDB[10]: 7a sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 CDB: Read CD msf sr 1:0:0:0: [sr0] tag#0 CDB[00]: b9 20 88 8e 8c 6f 16 ee e0 ed 40 13 e6 8f d6 79 sr 1:0:0:0: [sr0] tag#0 CDB[10]: 7a sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 CDB: Read CD msf sr 1:0:0:0: [sr0] tag#0 CDB[00]: b9 20 88 8e 8c 6f 16 ee e0 ed 40 13 e6 8f d6 79 sr 1:0:0:0: [sr0] tag#0 CDB[10]: 7a journal_path: not usable as path EXT4-fs: error: could not find journal device path journal_path: not usable as path EXT4-fs: error: could not find journal device path sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 CDB: Read CD msf sr 1:0:0:0: [sr0] tag#0 CDB[00]: b9 20 88 8e 8c 6f 16 ee e0 ed 40 13 e6 8f d6 79 sr 1:0:0:0: [sr0] tag#0 CDB[10]: 7a journal_path: not usable as path EXT4-fs: error: could not find journal device path journal_path: not usable as path EXT4-fs: error: could not find journal device path journal_path: not usable as path EXT4-fs: error: could not find journal device path loop7: detected capacity change from 0 to 256 FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop7: detected capacity change from 0 to 256 FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop7: detected capacity change from 0 to 256 FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop7: detected capacity change from 0 to 256 FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop7: detected capacity change from 0 to 40 loop7: detected capacity change from 0 to 40 loop4: detected capacity change from 0 to 40 loop7: detected capacity change from 0 to 40 loop4: detected capacity change from 0 to 40 loop7: detected capacity change from 0 to 40 loop4: detected capacity change from 0 to 40 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed Process accounting resumed random: crng reseeded on system resumption random: crng reseeded on system resumption Process accounting resumed random: crng reseeded on system resumption random: crng reseeded on system resumption random: crng reseeded on system resumption random: crng reseeded on system resumption random: crng reseeded on system resumption