syzbot has found a reproducer for the following issue on: HEAD commit: 367b5c3d53e5 Add linux-next specific files for 20240816 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=147f345b980000 kernel config: https://syzkaller.appspot.com/x/.config?x=61ba6f3b22ee5467 dashboard link: https://syzkaller.appspot.com/bug?extid=ca14b36a46a8c541b509 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13d6dbf3980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142413c5980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0b1b4e3cad3c/disk-367b5c3d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5bb090f7813c/vmlinux-367b5c3d.xz kernel image: https://storage.googleapis.com/syzbot-assets/6674cb0709b1/bzImage-367b5c3d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ca14b36a46a8c541b509@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected 6.11.0-rc3-next-20240816-syzkaller #0 Not tainted ------------------------------------------------------ kworker/u8:7/5301 is trying to acquire lock: ffffffff8e815038 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 but task is already holding lock: ffff8880b913ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:587 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->__lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:587 raw_spin_rq_lock kernel/sched/sched.h:1485 [inline] task_rq_lock+0xc6/0x360 kernel/sched/core.c:689 cgroup_move_task+0x92/0x2d0 kernel/sched/psi.c:1161 css_set_move_task+0x72e/0x950 kernel/cgroup/cgroup.c:898 cgroup_post_fork+0x256/0x880 kernel/cgroup/cgroup.c:6690 copy_process+0x3ab1/0x3e30 kernel/fork.c:2620 kernel_clone+0x226/0x8f0 kernel/fork.c:2806 user_mode_thread+0x132/0x1a0 kernel/fork.c:2884 rest_init+0x23/0x300 init/main.c:712 start_kernel+0x47a/0x500 init/main.c:1103 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 -> #1 (&p->pi_lock){-.-.}-{2:2}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4113 up+0x72/0x90 kernel/locking/semaphore.c:191 __up_console_sem kernel/printk/printk.c:340 [inline] __console_unlock kernel/printk/printk.c:2801 [inline] console_unlock+0x22f/0x4d0 kernel/printk/printk.c:3120 vprintk_emit+0x5dc/0x7c0 kernel/printk/printk.c:2348 dev_vprintk_emit+0x2ae/0x330 drivers/base/core.c:4921 dev_printk_emit+0xdd/0x120 drivers/base/core.c:4932 _dev_warn+0x122/0x170 drivers/base/core.c:4988 _request_firmware+0xd2c/0x12b0 drivers/base/firmware_loader/main.c:910 request_firmware_work_func+0x12a/0x280 drivers/base/firmware_loader/main.c:1165 process_one_work kernel/workqueue.c:3232 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3313 worker_thread+0x86d/0xd10 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 ((console_sem).lock){-...}-{2:2}: check_prev_add kernel/locking/lockdep.c:3136 [inline] check_prevs_add kernel/locking/lockdep.c:3255 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3871 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5145 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:323 console_trylock kernel/printk/printk.c:2754 [inline] console_trylock_spinning kernel/printk/printk.c:1958 [inline] vprintk_emit+0x2aa/0x7c0 kernel/printk/printk.c:2347 _printk+0xd5/0x120 kernel/printk/printk.c:2373 __report_bug lib/bug.c:195 [inline] report_bug+0x346/0x500 lib/bug.c:219 handle_bug+0x60/0x90 arch/x86/kernel/traps.c:285 exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:309 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline] rq_clock kernel/sched/sched.h:1624 [inline] replenish_dl_new_period kernel/sched/deadline.c:777 [inline] update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511 update_curr+0x575/0xb20 kernel/sched/fair.c:1176 put_prev_entity+0x3d/0x210 kernel/sched/fair.c:5505 put_prev_task_fair+0x4d/0x80 kernel/sched/fair.c:8686 put_prev_task kernel/sched/sched.h:2423 [inline] put_prev_task_balance+0x11d/0x190 kernel/sched/core.c:5886 __pick_next_task+0xc6/0x2f0 kernel/sched/core.c:5946 pick_next_task kernel/sched/core.c:6012 [inline] __schedule+0x725/0x4ad0 kernel/sched/core.c:6594 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6818 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6842 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x130/0x140 kernel/locking/spinlock.c:194 task_rq_unlock kernel/sched/sched.h:1759 [inline] __sched_setscheduler+0xf35/0x1ba0 kernel/sched/syscalls.c:858 _sched_setscheduler kernel/sched/syscalls.c:880 [inline] sched_setscheduler_nocheck+0x190/0x2e0 kernel/sched/syscalls.c:927 kthread+0x1aa/0x390 kernel/kthread.c:370 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->__lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->__lock); lock(&p->pi_lock); lock(&rq->__lock); lock((console_sem).lock); *** DEADLOCK *** 1 lock held by kworker/u8:7/5301: #0: ffff8880b913ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:587 stack backtrace: CPU: 1 UID: 0 PID: 5301 Comm: kworker/u8:7 Not tainted 6.11.0-rc3-next-20240816-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2189 check_prev_add kernel/locking/lockdep.c:3136 [inline] check_prevs_add kernel/locking/lockdep.c:3255 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3871 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5145 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139 __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:323 console_trylock kernel/printk/printk.c:2754 [inline] console_trylock_spinning kernel/printk/printk.c:1958 [inline] vprintk_emit+0x2aa/0x7c0 kernel/printk/printk.c:2347 _printk+0xd5/0x120 kernel/printk/printk.c:2373 __report_bug lib/bug.c:195 [inline] report_bug+0x346/0x500 lib/bug.c:219 handle_bug+0x60/0x90 arch/x86/kernel/traps.c:285 exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:309 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline] RIP: 0010:rq_clock kernel/sched/sched.h:1624 [inline] RIP: 0010:replenish_dl_new_period kernel/sched/deadline.c:777 [inline] RIP: 0010:update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511 Code: b5 50 fe ff ff 4c 89 ff ba 20 00 00 00 e8 e9 4f 00 00 e9 58 fe ff ff 4c 89 ef be 20 00 00 00 e8 b7 13 00 00 e9 46 fe ff ff 90 <0f> 0b 90 e9 be fb ff ff 89 f1 80 e1 07 38 c1 0f 8c b5 f9 ff ff 48 RSP: 0018:ffffc9000417f6c8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8880b903ea40 RCX: 0000000000000003 RDX: dffffc0000000000 RSI: ffffffff8c0adfc0 RDI: ffffffff8c60a8c0 RBP: 0000000000000031 R08: ffff8880b902c883 R09: 1ffff11017205910 R10: dffffc0000000000 R11: ffffed1017205911 R12: ffff8880b903f468 R13: ffff8880b903f428 R14: 1ffff11017207e8f R15: ffff8880b903f858 update_curr+0x575/0xb20 kernel/sched/fair.c:1176 put_prev_entity+0x3d/0x210 kernel/sched/fair.c:5505 put_prev_task_fair+0x4d/0x80 kernel/sched/fair.c:8686 put_prev_task kernel/sched/sched.h:2423 [inline] put_prev_task_balance+0x11d/0x190 kernel/sched/core.c:5886 __pick_next_task+0xc6/0x2f0 kernel/sched/core.c:5946 pick_next_task kernel/sched/core.c:6012 [inline] __schedule+0x725/0x4ad0 kernel/sched/core.c:6594 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6818 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6842 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x130/0x140 kernel/locking/spinlock.c:194 task_rq_unlock kernel/sched/sched.h:1759 [inline] __sched_setscheduler+0xf35/0x1ba0 kernel/sched/syscalls.c:858 _sched_setscheduler kernel/sched/syscalls.c:880 [inline] sched_setscheduler_nocheck+0x190/0x2e0 kernel/sched/syscalls.c:927 kthread+0x1aa/0x390 kernel/kthread.c:370 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> WARNING: CPU: 1 PID: 5301 at kernel/sched/sched.h:1476 lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline] WARNING: CPU: 1 PID: 5301 at kernel/sched/sched.h:1476 rq_clock kernel/sched/sched.h:1624 [inline] WARNING: CPU: 1 PID: 5301 at kernel/sched/sched.h:1476 replenish_dl_new_period kernel/sched/deadline.c:777 [inline] WARNING: CPU: 1 PID: 5301 at kernel/sched/sched.h:1476 update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511 Modules linked in: CPU: 1 UID: 0 PID: 5301 Comm: kworker/u8:7 Not tainted 6.11.0-rc3-next-20240816-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline] RIP: 0010:rq_clock kernel/sched/sched.h:1624 [inline] RIP: 0010:replenish_dl_new_period kernel/sched/deadline.c:777 [inline] RIP: 0010:update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511 Code: b5 50 fe ff ff 4c 89 ff ba 20 00 00 00 e8 e9 4f 00 00 e9 58 fe ff ff 4c 89 ef be 20 00 00 00 e8 b7 13 00 00 e9 46 fe ff ff 90 <0f> 0b 90 e9 be fb ff ff 89 f1 80 e1 07 38 c1 0f 8c b5 f9 ff ff 48 RSP: 0018:ffffc9000417f6c8 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffff8880b903ea40 RCX: 0000000000000003 RDX: dffffc0000000000 RSI: ffffffff8c0adfc0 RDI: ffffffff8c60a8c0 RBP: 0000000000000031 R08: ffff8880b902c883 R09: 1ffff11017205910 R10: dffffc0000000000 R11: ffffed1017205911 R12: ffff8880b903f468 R13: ffff8880b903f428 R14: 1ffff11017207e8f R15: ffff8880b903f858 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f69bb64cd58 CR3: 0000000078782000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> update_curr+0x575/0xb20 kernel/sched/fair.c:1176 put_prev_entity+0x3d/0x210 kernel/sched/fair.c:5505 put_prev_task_fair+0x4d/0x80 kernel/sched/fair.c:8686 put_prev_task kernel/sched/sched.h:2423 [inline] put_prev_task_balance+0x11d/0x190 kernel/sched/core.c:5886 __pick_next_task+0xc6/0x2f0 kernel/sched/core.c:5946 pick_next_task kernel/sched/core.c:6012 [inline] __schedule+0x725/0x4ad0 kernel/sched/core.c:6594 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6818 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6842 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x130/0x140 kernel/locking/spinlock.c:194 task_rq_unlock kernel/sched/sched.h:1759 [inline] __sched_setscheduler+0xf35/0x1ba0 kernel/sched/syscalls.c:858 _sched_setscheduler kernel/sched/syscalls.c:880 [inline] sched_setscheduler_nocheck+0x190/0x2e0 kernel/sched/syscalls.c:927 kthread+0x1aa/0x390 kernel/kthread.c:370 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
