BUG: soft lockup in kernel_init

[sanan.hasanou@gmail.com]

Good day, dear maintainers,

We found a bug using a modified version of syzkaller.

Kernel Branch: 7.0-rc1
Kernel Config: <https://drive.google.com/open?id=1mAp3gxor4yGtL0ZArdrc1E7ufSn4T841>
Unfortunately, we don't have any reproducer for this bug yet.
Thank you!

Best regards,
Sanan Hasanov

watchdog: BUG: soft lockup - CPU#0 stuck for 142s! [swapper/0:1]
Modules linked in:
irq event stamp: 1640392
hardirqs last  enabled at (1640391): [<ffffffff819f6073>] console_trylock_spinning kernel/printk/printk.c:2032 [inline]
hardirqs last  enabled at (1640391): [<ffffffff819f6073>] vprintk_emit+0x3b3/0x550 kernel/printk/printk.c:2478
hardirqs last disabled at (1640392): [<ffffffff8b54d19e>] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1056
softirqs last  enabled at (1640360): [<ffffffff81842680>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last  enabled at (1640360): [<ffffffff81842680>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last  enabled at (1640360): [<ffffffff81842680>] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723
softirqs last disabled at (1640327): [<ffffffff81842680>] __do_softirq kernel/softirq.c:656 [inline]
softirqs last disabled at (1640327): [<ffffffff81842680>] invoke_softirq kernel/softirq.c:496 [inline]
softirqs last disabled at (1640327): [<ffffffff81842680>] __irq_exit_rcu+0x60/0x150 kernel/softirq.c:723
CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 7.0.0-rc1 #1 PREEMPT(full) 
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline]
RIP: 0010:vprintk_emit+0x453/0x550 kernel/printk/printk.c:2478
Code: 0f 84 44 ff ff ff e8 5c d7 1f 00 fb eb 44 e8 54 d7 1f 00 e8 af 78 b5 09 4d 85 f6 74 94 e8 45 d7 1f 00 fb 48 c7 c7 20 e0 d4 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 a5 35
RSP: 0018:ffffc9000012f220 EFLAGS: 00000293
RAX: ffffffff819f610b RBX: ffffffff819f5f85 RCX: ffff88801a6f5700
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8dd4e020
RBP: ffffc9000012f2d0 R08: ffffffff8f722db7 R09: 1ffffffff1ee45b6
R10: dffffc0000000000 R11: fffffbfff1ee45b7 R12: 0000000000000045
R13: 0000000000000000 R14: 0000000000000200 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88809ab94000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8880186b4000 CR3: 000000000db4a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 dev_vprintk_emit+0x337/0x3f0 drivers/base/core.c:4913
 dev_printk_emit+0xe0/0x120 drivers/base/core.c:4924
 _dev_info+0x10a/0x150 drivers/base/core.c:4982
 cmos_do_probe+0xca4/0x1020 drivers/rtc/rtc-cmos.c:1121
 pnp_device_probe+0x305/0x4b0 drivers/pnp/driver.c:111
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x258/0xae0 drivers/base/dd.c:661
 __driver_probe_device+0x18c/0x320 drivers/base/dd.c:803
 driver_probe_device+0x4f/0x230 drivers/base/dd.c:833
 __driver_attach+0x3e1/0x710 drivers/base/dd.c:1227
 bus_for_each_dev+0x22c/0x2a0 drivers/base/bus.c:383
 bus_add_driver+0x340/0x670 drivers/base/bus.c:715
 driver_register+0x23a/0x310 drivers/base/driver.c:249
 cmos_init+0x11/0x80 drivers/rtc/rtc-cmos.c:1546
 do_one_initcall+0x1eb/0x870 init/main.c:1382
 do_initcall_level+0x104/0x190 init/main.c:1444
 do_initcalls+0x59/0xa0 init/main.c:1460
 kernel_init_freeable+0x2a0/0x3e0 init/main.c:1692
 kernel_init+0x1d/0x1c0 init/main.c:1582
 ret_from_fork+0x507/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:245
 </TASK>

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