Hello! The following git patch 044d0d6de9f50192f9697583504a382347ee95ca (linux git master branch) introduced the following kernel OOPS upon kernel boot on my sparc64 T5-2 ldom (VM): $ uname -a Linux ttip 5.9.0-rc2-00011-g044d0d6de9f5 #59 SMP Thu Sep 10 13:07:45 MSK 2020 sparc64 GNU/Linux (OOPS is from the latest tag, but the same on commit above) ... rcu: Hierarchical SRCU implementation. smp: Bringing up secondary CPUs ... ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:4875 check_flags+0x9c/0x2c0 DEBUG_LOCKS_WARN_ON(lockdep_hardirqs_enabled()) Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.9.0-rc4 #36 Call Trace: [<00000000004727a8>] __warn+0xa8/0x120 [<0000000000472c10>] warn_slowpath_fmt+0x64/0x74 [<00000000004e859c>] check_flags+0x9c/0x2c0 [<0000000000c17ca0>] lock_is_held_type+0x20/0x140 [<00000000005095f4>] rcu_read_lock_sched_held+0x54/0xa0 [<00000000004ed4c0>] lock_acquire+0x120/0x480 [<0000000000c21610>] _raw_spin_lock+0x30/0x60 [<00000000009b9bdc>] p1275_cmd_direct+0x1c/0x60 [<00000000009b9ab0>] prom_startcpu_cpuid+0x30/0x40 [<00000000004427e4>] __cpu_up+0x184/0x3a0 [<0000000000474600>] bringup_cpu+0x20/0x120 [<000000000047378c>] cpuhp_invoke_callback+0xec/0x340 [<00000000004753d4>] cpu_up+0x154/0x220 [<0000000000475c60>] bringup_nonboot_cpus+0x60/0xa0 [<0000000000fbc338>] smp_init+0x28/0xa0 [<0000000000fad3b4>] kernel_init_freeable+0x18c/0x300 irq event stamp: 5135 hardirqs last enabled at (5135): [<0000000000c21a28>] _raw_spin_unlock_irqrestore+0x28/0x60 hardirqs last disabled at (5134): [<0000000000c217e0>] _raw_spin_lock_irqsave+0x20/0x80 softirqs last enabled at (1474): [<0000000000c245a0>] __do_softirq+0x4e0/0x560 softirqs last disabled at (1467): [<000000000042d394>] do_softirq_own_stack+0x34/0x60 random: get_random_bytes called from __warn+0xc8/0x120 with crng_init=0 ---[ end trace 4cf960ae85148e2e ]--- possible reason: unannotated irqs-off. irq event stamp: 5135 hardirqs last enabled at (5135): [<0000000000c21a28>] _raw_spin_unlock_irqrestore+0x28/0x60 hardirqs last disabled at (5134): [<0000000000c217e0>] _raw_spin_lock_irqsave+0x20/0x80 softirqs last enabled at (1474): [<0000000000c245a0>] __do_softirq+0x4e0/0x560 softirqs last disabled at (1467): [<000000000042d394>] do_softirq_own_stack+0x34/0x60 smp: Brought up 1 node, 32 CPUs devtmpfs: initialized ... full boot log in [1], kernel config in [2] linux-2.6$ git bisect log git bisect start # good: [d012a7190fc1fd72ed48911e77ca97ba4521bccd] Linux 5.9-rc2 git bisect good d012a7190fc1fd72ed48911e77ca97ba4521bccd # bad: [34d4ddd359dbcdf6c5fb3f85a179243d7a1cb7f8] Merge tag 'linux-kselftest-5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest git bisect bad 34d4ddd359dbcdf6c5fb3f85a179243d7a1cb7f8 # bad: [e1d0126ca3a66c284a02b083a42e2b39558002cd] Merge tag 'xfs-5.9-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux git bisect bad e1d0126ca3a66c284a02b083a42e2b39558002cd # good: [24148d8648e37f8c15bedddfa50d14a31a0582c5] Merge tag 'io_uring-5.9-2020-08-28' of git://git.kernel.dk/linux-block git bisect good 24148d8648e37f8c15bedddfa50d14a31a0582c5 # bad: [b69bea8a657b681442765b06be92a2607b1bd875] Merge tag 'locking-urgent-2020-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect bad b69bea8a657b681442765b06be92a2607b1bd875 # good: [20934c0de13b49a072fb1e0ca79fe0fe0e40eae5] usb: storage: Add unusual_uas entry for Sony PSZ drives git bisect good 20934c0de13b49a072fb1e0ca79fe0fe0e40eae5 # good: [c4011283a7d5d64a50991dd3baa9acdf3d49092c] Merge tag 'dma-mapping-5.9-2' of git://git.infradead.org/users/hch/dma-mapping git bisect good c4011283a7d5d64a50991dd3baa9acdf3d49092c # good: [8bb5021cc2ee5d5dd129a9f2f5ad2bb76eea297d] Merge tag 'powerpc-5.9-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux git bisect good 8bb5021cc2ee5d5dd129a9f2f5ad2bb76eea297d # good: [00b0ed2d4997af6d0a93edef820386951fd66d94] locking/lockdep: Cleanup git bisect good 00b0ed2d4997af6d0a93edef820386951fd66d94 # bad: [044d0d6de9f50192f9697583504a382347ee95ca] lockdep: Only trace IRQ edges git bisect bad 044d0d6de9f50192f9697583504a382347ee95ca # good: [021c109330ebc1f54b546c63a078ea3c31356ecb] arm64: Implement arch_irqs_disabled() git bisect good 021c109330ebc1f54b546c63a078ea3c31356ecb # good: [99dc56feb7932020502d40107a712fa302b32082] mips: Implement arch_irqs_disabled() git bisect good 99dc56feb7932020502d40107a712fa302b32082 # first bad commit: [044d0d6de9f50192f9697583504a382347ee95ca] lockdep: Only trace IRQ edges 1. https://github.com/mator/sparc64-dmesg/blob/master/dmesg-5.9.0-rc4 2. https://github.com/mator/sparc64-dmesg/blob/master/config-5.9.0-rc4.gz
