Hello! Bisected the following call trace on kernel boot with linux sparc64 debian sid LDOM: ... [ 1.722396] des_sparc64: Using sparc64 des opcodes optimized DES implementation [ 2.256609] camellia_sparc64: Using sparc64 camellia opcodes optimized CAMELLIA implementation [ 2.460130] workingset: timestamp_bits=46 max_order=23 bucket_order=0 [ 2.478401] zbud: loaded [ 2.480698] SGI XFS with ACLs, security attributes, quota, fatal assert, debug enabled [ 2.486675] *** VALIDATE xfs *** [ 2.501604] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252) [ 2.502560] io scheduler mq-deadline registered [ 2.505276] f029b788: ttyHV0 at I/O 0x0 (irq = 1, base_baud = 115200) is a SUN4V HCONS [ 2.505359] INFO: trying to register non-static key. [ 2.505365] the code is fine but needs lockdep annotation. [ 2.505371] turning off the locking correctness validator. [ 2.505380] CPU: 16 PID: 1 Comm: swapper/0 Not tainted 5.6.0-rc5-00128-ga3cb39d258ef #55 [ 2.505388] Call Trace: [ 2.505402] [00000000004dbbd8] register_lock_class+0x278/0x720 [ 2.505410] [00000000004d8930] __lock_acquire+0x90/0x2520 [ 2.505416] [00000000004db74c] lock_acquire+0x1ac/0x1e0 [ 2.505426] [0000000000b86404] _raw_spin_lock_irqsave+0x44/0x60 [ 2.505439] [000000000097245c] uart_add_one_port+0x35c/0x500 [ 2.505447] [0000000000977ee4] hv_probe+0x144/0x200 [ 2.505455] [00000000009888f4] platform_drv_probe+0x34/0xa0 [ 2.505462] [0000000000986414] really_probe+0x214/0x460 [ 2.505468] [0000000000986b7c] driver_probe_device+0xfc/0x140 [ 2.505475] [0000000000986e5c] device_driver_attach+0x3c/0x60 [ 2.505481] [0000000000986fc8] __driver_attach+0x148/0x160 [ 2.505488] [0000000000984b04] bus_for_each_dev+0x44/0xa0 [ 2.505495] [0000000000986ffc] driver_attach+0x1c/0x40 [ 2.505501] [0000000000985184] bus_add_driver+0x124/0x220 [ 2.505507] [00000000009877a4] driver_register+0xc4/0x120 [ 2.505514] [0000000000988860] __platform_driver_register+0x40/0x60 [ 2.506081] printk: console [ttyHV0] enabled [ 2.507815] sunvdc.c:v1.2 (November 24, 2014) [ 2.509338] sunvdc: Virtual Hard disk vdiskc ... Can someone look why it is started to print stack trace? Thanks. Full boot log files are at https://github.com/mator/sparc64-dmesg/ Full bisect log: mator@ttip:~/linux-2.6$ git bisect bad a3cb39d258efef830181606134cfb0f7babe8c8e is the first bad commit commit a3cb39d258efef830181606134cfb0f7babe8c8e Author: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Date: Mon Feb 17 13:40:12 2020 +0200 serial: core: Allow detach and attach serial device for console In the future we would like to disable power management on the serial devices used as kernel consoles to avoid weird behaviour in some cases. However, disabling PM may prevent system to go to deep sleep states, which in its turn leads to the higher power consumption. Tony Lindgren proposed a work around, i.e. allow user to detach such consoles to make PM working again. In case user wants to see what's going on, it also provides a mechanism to attach console back. Link: https://lists.openwall.net/linux-kernel/2018/09/29/65 Suggested-by: Tony Lindgren <tony@xxxxxxxxxxx> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20200217114016.49856-3-andriy.shevchenko@xxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Documentation/ABI/testing/sysfs-tty | 7 +++++ drivers/tty/serial/serial_core.c | 60 ++++++++++++++++++++++++++++++++++--- 2 files changed, 63 insertions(+), 4 deletions(-) mator@ttip:~/linux-2.6$ mator@ttip:~/linux-2.6$ git bisect log git bisect start # bad: [1a323ea5356edbb3073dc59d51b9e6b86908857d] x86: get rid of 'errret' argument to __get_user_xyz() macross git bisect bad 1a323ea5356edbb3073dc59d51b9e6b86908857d # good: [458ef2a25e0cbdc216012aa2b9cf549d64133b08] Merge tag 'x86-timers-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good 458ef2a25e0cbdc216012aa2b9cf549d64133b08 # good: [2efefb56f92689b2e216857834df69dd3ea47d2b] ice: use __le16 types for explicitly Little Endian values git bisect good 2efefb56f92689b2e216857834df69dd3ea47d2b # bad: [1f944f976d7ef8a29d1ad296253d3a9387c58e62] Merge tag 'tty-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty git bisect bad 1f944f976d7ef8a29d1ad296253d3a9387c58e62 # good: [15c981d16d70e8a5be297fa4af07a64ab7e080ed] Merge tag 'for-5.7-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux git bisect good 15c981d16d70e8a5be297fa4af07a64ab7e080ed # good: [dfabb077d62552797ca0ae7756cb30d3e195ead5] Merge tag 'mmc-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc git bisect good dfabb077d62552797ca0ae7756cb30d3e195ead5 # good: [058bc104f7ca5c83d81695ee96f03dbd93bae518] serial: 8250: Generalize rs485 software emulation git bisect good 058bc104f7ca5c83d81695ee96f03dbd93bae518 # good: [5f3a48132412123135595fcbb2a760cfe626f592] Merge branch 'for-5.7-console-exit' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk into tty-next git bisect good 5f3a48132412123135595fcbb2a760cfe626f592 # bad: [4bcf59a5dea0f4e768e2b84fc78ce13a7fb27863] serial: 8250: 8250_omap: Account for data in flight during DMA teardown git bisect bad 4bcf59a5dea0f4e768e2b84fc78ce13a7fb27863 # bad: [caa47cc639470485ee0ae3c76d56ccf4cfda2045] tty: nozomi: Use scnprintf() for avoiding potential buffer overflow git bisect bad caa47cc639470485ee0ae3c76d56ccf4cfda2045 # bad: [630db5cbc7b444bf47cd717906abb092a2ab5724] tty: serial: Add CONSOLE_POLL support to SiFive UART git bisect bad 630db5cbc7b444bf47cd717906abb092a2ab5724 # bad: [bedb404e91bb2908d9921fc736a518a9d89525fc] serial: 8250_port: Don't use power management for kernel console git bisect bad bedb404e91bb2908d9921fc736a518a9d89525fc # bad: [a3cb39d258efef830181606134cfb0f7babe8c8e] serial: core: Allow detach and attach serial device for console git bisect bad a3cb39d258efef830181606134cfb0f7babe8c8e # first bad commit: [a3cb39d258efef830181606134cfb0f7babe8c8e] serial: core: Allow detach and attach serial device for console
