syzbot has found a reproducer for the following issue on: HEAD commit: de7e71ef8bed mm: simplify and improve print_vma_addr() out.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1358d748980000 kernel config: https://syzkaller.appspot.com/x/.config?x=45d62832ec0fc911 dashboard link: https://syzkaller.appspot.com/bug?extid=57cc2f20a84cb4346354 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10cd9414980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=140480ec980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-de7e71ef.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0c97829b07ce/vmlinux-de7e71ef.xz kernel image: https://storage.googleapis.com/syzbot-assets/e91040d0f4f3/bzImage-de7e71ef.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+57cc2f20a84cb4346354@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ ====================================================== WARNING: possible circular locking dependency detected 6.9.0-syzkaller-11924-gde7e71ef8bed #0 Not tainted ------------------------------------------------------ syz-executor379/5188 is trying to acquire lock: ffffffff8dabed20 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1994 [inline] ffffffff8dabed20 (console_owner){....}-{0:0}, at: vprintk_emit kernel/printk/printk.c:2344 [inline] ffffffff8dabed20 (console_owner){....}-{0:0}, at: vprintk_emit+0x42d/0x5a0 kernel/printk/printk.c:2300 but task is already holding lock: ffffffff94de6f38 (&port_lock_key){-...}-{2:2}, at: uart_port_lock_irqsave include/linux/serial_core.h:618 [inline] ffffffff94de6f38 (&port_lock_key){-...}-{2:2}, at: uart_write+0x134/0x3e0 drivers/tty/serial/serial_core.c:624 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&port_lock_key){-...}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 uart_port_lock_irqsave include/linux/serial_core.h:618 [inline] serial8250_console_write+0xaa6/0x1090 drivers/tty/serial/8250/8250_port.c:3352 console_emit_next_record kernel/printk/printk.c:2928 [inline] console_flush_all+0x53f/0xd70 kernel/printk/printk.c:2994 console_unlock+0xae/0x290 kernel/printk/printk.c:3063 vprintk_emit kernel/printk/printk.c:2345 [inline] vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2300 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2370 register_console+0xa88/0x10a0 kernel/printk/printk.c:3596 univ8250_console_init+0x35/0x50 drivers/tty/serial/8250/8250_core.c:719 console_init+0xcc/0x680 kernel/printk/printk.c:3742 start_kernel+0x295/0x4c0 init/main.c:1038 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x148 -> #0 (console_owner){....}-{0:0}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 console_trylock_spinning kernel/printk/printk.c:1994 [inline] vprintk_emit kernel/printk/printk.c:2344 [inline] vprintk_emit+0x442/0x5a0 kernel/printk/printk.c:2300 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2370 __report_bug lib/bug.c:195 [inline] report_bug+0x4ac/0x580 lib/bug.c:219 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625 tnc_init drivers/net/hamradio/6pack.c:531 [inline] sixpack_open+0x93b/0xb30 drivers/net/hamradio/6pack.c:628 tty_ldisc_open+0x9c/0x120 drivers/tty/tty_ldisc.c:432 tty_set_ldisc+0x318/0x720 drivers/tty/tty_ldisc.c:563 tiocsetd drivers/tty/tty_io.c:2439 [inline] tty_ioctl+0xbdc/0x15f0 drivers/tty/tty_io.c:2739 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&port_lock_key); lock(console_owner); lock(&port_lock_key); lock(console_owner); *** DEADLOCK *** 3 locks held by syz-executor379/5188: #0: ffff888011ccc1c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_set_ldisc+0x8b/0x720 drivers/tty/tty_ldisc.c:528 #1: ffff888011ccc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:289 [inline] #1: ffff888011ccc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock+0x65/0xb0 drivers/tty/tty_ldisc.c:313 #2: ffffffff94de6f38 (&port_lock_key){-...}-{2:2}, at: uart_port_lock_irqsave include/linux/serial_core.h:618 [inline] #2: ffffffff94de6f38 (&port_lock_key){-...}-{2:2}, at: uart_write+0x134/0x3e0 drivers/tty/serial/serial_core.c:624 stack backtrace: CPU: 2 PID: 5188 Comm: syz-executor379 Not tainted 6.9.0-syzkaller-11924-gde7e71ef8bed #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 console_trylock_spinning kernel/printk/printk.c:1994 [inline] vprintk_emit kernel/printk/printk.c:2344 [inline] vprintk_emit+0x442/0x5a0 kernel/printk/printk.c:2300 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45 _printk+0xc8/0x100 kernel/printk/printk.c:2370 __report_bug lib/bug.c:195 [inline] report_bug+0x4ac/0x580 lib/bug.c:219 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621 RIP: 0010:uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625 Code: 6b fc e9 4e ff ff ff e8 ef e1 90 fc 90 0f 0b 90 49 c7 c4 d2 ff ff ff e9 39 ff ff ff e8 da e1 90 fc 45 31 ff e8 d2 e1 90 fc 90 <0f> 0b 90 48 85 ed 74 8c e8 c4 e1 90 fc 4c 8d a5 08 01 00 00 4c 89 RSP: 0018:ffffc90003137bd8 EFLAGS: 00010093 RAX: 0000000000000000 RBX: ffff88801f908be8 RCX: ffffffff816c49ad RDX: ffff88802a360000 RSI: ffffffff84fd0abe RDI: ffff88801f908f48 RBP: ffffffff94de6f20 R08: 0000000000000001 R09: fffff52000626f69 R10: 0000000000000003 R11: 0000000000000002 R12: 0000000000000001 R13: 0000000000000001 R14: ffff888024980f01 R15: 0000000000000293 tnc_init drivers/net/hamradio/6pack.c:531 [inline] sixpack_open+0x93b/0xb30 drivers/net/hamradio/6pack.c:628 tty_ldisc_open+0x9c/0x120 drivers/tty/tty_ldisc.c:432 tty_set_ldisc+0x318/0x720 drivers/tty/tty_ldisc.c:563 tiocsetd drivers/tty/tty_io.c:2439 [inline] tty_ioctl+0xbdc/0x15f0 drivers/tty/tty_io.c:2739 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f956812d2e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeea498a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffeea498c18 RCX: 00007f956812d2e9 RDX: 0000000020000080 RSI: 0000000000005423 RDI: 0000000000000003 RBP: 00007f95681a0610 R08: 0000000000000000 R09: 00007ffeea498c18 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffeea498c08 R14: 0000000000000001 R15: 0000000000000001 </TASK> WARNING: CPU: 2 PID: 5188 at drivers/tty/serial/serial_core.c:625 uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625 Modules linked in: CPU: 2 PID: 5188 Comm: syz-executor379 Not tainted 6.9.0-syzkaller-11924-gde7e71ef8bed #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:uart_write+0x2bf/0x3e0 drivers/tty/serial/serial_core.c:625 Code: 6b fc e9 4e ff ff ff e8 ef e1 90 fc 90 0f 0b 90 49 c7 c4 d2 ff ff ff e9 39 ff ff ff e8 da e1 90 fc 45 31 ff e8 d2 e1 90 fc 90 <0f> 0b 90 48 85 ed 74 8c e8 c4 e1 90 fc 4c 8d a5 08 01 00 00 4c 89 RSP: 0018:ffffc90003137bd8 EFLAGS: 00010093 RAX: 0000000000000000 RBX: ffff88801f908be8 RCX: ffffffff816c49ad RDX: ffff88802a360000 RSI: ffffffff84fd0abe RDI: ffff88801f908f48 RBP: ffffffff94de6f20 R08: 0000000000000001 R09: fffff52000626f69 R10: 0000000000000003 R11: 0000000000000002 R12: 0000000000000001 R13: 0000000000000001 R14: ffff888024980f01 R15: 0000000000000293 FS: 0000555560c5f380(0000) GS:ffff88806b200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 000000001e942000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> tnc_init drivers/net/hamradio/6pack.c:531 [inline] sixpack_open+0x93b/0xb30 drivers/net/hamradio/6pack.c:628 tty_ldisc_open+0x9c/0x120 drivers/tty/tty_ldisc.c:432 tty_set_ldisc+0x318/0x720 drivers/tty/tty_ldisc.c:563 tiocsetd drivers/tty/tty_io.c:2439 [inline] tty_ioctl+0xbdc/0x15f0 drivers/tty/tty_io.c:2739 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f956812d2e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeea498a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffeea498c18 RCX: 00007f956812d2e9 RDX: 0000000020000080 RSI: 0000000000005423 RDI: 0000000000000003 RBP: 00007f95681a0610 R08: 0000000000000000 R09: 00007ffeea498c18 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffeea498c08 R14: 0000000000000001 R15: 0000000000000001 </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.
