audit: type=1400 audit(1664507718.939:8): avc: denied { kernel } for pid=3851 comm="syz-executor.2" 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.2/3852 is trying to acquire lock: ffffffff853faab8 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x70 but task is already holding lock: ffff88800d77f420 (&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.2/3852: #0: ffff88806ce37e98 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x1cf/0x2470 #1: ffff88800d77f420 (&ctx->lock){....}-{2:2}, at: __perf_event_task_sched_out+0x53b/0x18d0 stack backtrace: CPU: 0 PID: 3852 Comm: syz-executor.2 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:ffff88803e8f7c48 EFLAGS: 00010006 RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88803e4c1ac0 RSI: ffffffff81565e67 RDI: 0000000000000005 RBP: ffff888008660000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800d77f400 R13: ffff88806ce3d2c0 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: 0033:0x7f1ea67d5b19 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:00007f1ea3d4b218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f1ea68e8f68 RCX: 00007f1ea67d5b19 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f1ea68e8f6c RBP: 00007f1ea68e8f60 R08: 000000000000000e R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f1ea68e8f6c R13: 00007ffc2744b12f R14: 00007f1ea3d4b300 R15: 0000000000022000 WARNING: CPU: 0 PID: 3852 at kernel/events/core.c:2309 group_sched_out.part.0+0x2c7/0x460 Modules linked in: CPU: 0 PID: 3852 Comm: syz-executor.2 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:ffff88803e8f7c48 EFLAGS: 00010006 RAX: 0000000040000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88803e4c1ac0 RSI: ffffffff81565e67 RDI: 0000000000000005 RBP: ffff888008660000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800d77f400 R13: ffff88806ce3d2c0 R14: ffffffff8547c9a0 R15: 0000000000000002 FS: 00007f1ea3d4b700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc707db6010 CR3: 000000001d036000 CR4: 0000000000350ef0 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: 0033:0x7f1ea67d5b19 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:00007f1ea3d4b218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f1ea68e8f68 RCX: 00007f1ea67d5b19 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f1ea68e8f6c RBP: 00007f1ea68e8f60 R08: 000000000000000e R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f1ea68e8f6c R13: 00007ffc2744b12f R14: 00007f1ea3d4b300 R15: 0000000000022000 irq event stamp: 424 hardirqs last enabled at (423): [] exit_to_user_mode_prepare+0x109/0x1a0 hardirqs last disabled at (424): [] __schedule+0x1225/0x2470 softirqs last enabled at (0): [] copy_process+0x1e15/0x6e20 softirqs last disabled at (0): [<0000000000000000>] 0x0 ---[ end trace 0000000000000000 ]--- audit: type=1400 audit(1664507719.118:9): avc: denied { write } for pid=3851 comm="syz-executor.2" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 loop5: detected capacity change from 0 to 256 FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop5: detected capacity change from 0 to 256 FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop1: detected capacity change from 0 to 256 loop4: detected capacity change from 0 to 256 FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop5: detected capacity change from 0 to 256 loop2: detected capacity change from 0 to 256 FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop6: detected capacity change from 0 to 256 loop0: detected capacity change from 0 to 256 FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop1: detected capacity change from 0 to 256 loop6: detected capacity change from 0 to 256 loop2: detected capacity change from 0 to 256 loop5: detected capacity change from 0 to 256 loop4: detected capacity change from 0 to 256 loop0: detected capacity change from 0 to 256 FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop7: detected capacity change from 0 to 256 FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop3: detected capacity change from 0 to 256 FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop3): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop6: detected capacity change from 0 to 256 loop0: detected capacity change from 0 to 256 loop7: detected capacity change from 0 to 256 loop1: detected capacity change from 0 to 256 loop4: detected capacity change from 0 to 256 loop2: detected capacity change from 0 to 256 FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop5: detected capacity change from 0 to 256 FAT-fs (loop0): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop1): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop3: detected capacity change from 0 to 256 FAT-fs (loop3): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop5: detected capacity change from 0 to 256 FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop3: detected capacity change from 0 to 256 FAT-fs (loop3): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop5: detected capacity change from 0 to 256 loop7: detected capacity change from 0 to 256 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. ISOFS: Unable to identify CD-ROM format. FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. SELinux: security_context_str_to_sid (root) failed with errno=-22 SELinux: security_context_str_to_sid (root) failed with errno=-22 ISOFS: Unable to identify CD-ROM format. ISOFS: Unable to identify CD-ROM format. SELinux: security_context_str_to_sid (root) failed with errno=-22 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. ISOFS: Unable to identify CD-ROM format. SELinux: security_context_str_to_sid (root) failed with errno=-22 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.2'. SELinux: security_context_str_to_sid (root) failed with errno=-22 sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.0 not setting count and/or reply_len properly loop1: detected capacity change from 0 to 512 EXT4-fs (loop1): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir412116153/syzkaller.enfauU/17/file0 supports timestamps until 2038 (0x7fffffff) EXT4-fs (loop1): unmounting filesystem. loop1: detected capacity change from 0 to 512 sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.0 not setting count and/or reply_len properly sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.5 not setting count and/or reply_len properly EXT4-fs (loop1): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir412116153/syzkaller.enfauU/18/file0 supports timestamps until 2038 (0x7fffffff) EXT4-fs (loop1): unmounting filesystem. loop1: detected capacity change from 0 to 512 sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.7 not setting count and/or reply_len properly EXT4-fs (loop1): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir412116153/syzkaller.enfauU/19/file0 supports timestamps until 2038 (0x7fffffff) EXT4-fs (loop1): unmounting filesystem. loop1: detected capacity change from 0 to 512 sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.2 not setting count and/or reply_len properly sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.5 not setting count and/or reply_len properly sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.0 not setting count and/or reply_len properly sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.7 not setting count and/or reply_len properly EXT4-fs (loop1): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir412116153/syzkaller.enfauU/20/file0 supports timestamps until 2038 (0x7fffffff) EXT4-fs (loop1): unmounting filesystem. sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.3 not setting count and/or reply_len properly sg_write: data in/out 524252/251 bytes for SCSI command 0x0-- guessing data in; program syz-executor.0 not setting count and/or reply_len properly hrtimer: interrupt took 15189 ns SELinux: Context system_u:object_r:hald_mac_exec_t:s0 is not valid (left unmapped). audit: type=1400 audit(1664507728.318:10): avc: denied { associate } for pid=4395 comm="syz-executor.0" name="autofs" dev="devtmpfs" ino=93 scontext=system_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:device_t:s0 tclass=filesystem permissive=1 srawcon="system_u:object_r:hald_mac_exec_t:s0"