BUG: scheduling while atomic: swapper/1/0/0xffff0000

BUG: scheduling while atomic: swapper/1/0/0xffff0000

[Andreas Schwab]

I'm getting a lot of these messages on a panda board:

[  572.187805] BUG: scheduling while atomic: swapper/1/0/0xffff0000
[  572.187835] Modules linked in: af_packet snd_soc_dmic snd_soc_omap_hdmi snd_soc_omap_abe_twl6040 snd_soc_twl6040 omap_remoteproc smsc smsc95xx usbnet omap_ocp2scp mii ti_soc_thermal bq27xxx_battery_hdq bq27xxx_battery rfkill omap_hdq wire twl6030_gpadc industrialio omap_rng snd_soc_omap_mcbsp snd_soc_omap_mcpdm snd_soc_ti_sdma snd_soc_core snd_compress qrtr ac97_bus snd_pcm_dmaengine snd_pcm snd_timer snd soundcore leds_gpio efi_pstore cpufreq_dt uio_pdrv_genirq uio nls_iso8859_1 nls_cp437 vfat fat fuse efivarfs ip_tables x_tables ext4 mbcache jbd2 mmc_block clk_twl6040 gpio_twl6040 omapdrm ti_abb_regulator omap_sham omap_aes_driver omap4_keypad omap_mailbox omap2430 ohci_platform ohci_hcd pbias_regulator phy_twl6030_usb ehci_omap phy_omap_usb2 ehci_hcd musb_hdrc omap_dma udc_core phy_omap_control omap_des omap_hsmmc crypto_engine usbcore mmc_core omap_crypto libdes spi_omap2_mcspi usb_common pwm_twl_led twl6030_regulator pwm_twl ti_tfp410 display_connector omap_wdt
[  572.188537]  drm_kms_helper phy_generic syscopyarea sysfillrect ti_tpd12s015 gpio_keys fb_sys_fops ledtrig_heartbeat sg dm_multipath dm_mod dax scsi_dh_rdac scsi_dh_emc scsi_dh_alua
[  572.188659] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W         5.18.4-1-default #1 openSUSE Tumbleweed 89a11705cdd7557b347c90566dc52d3793f62b0a
[  572.188690] Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2022.04 04/01/2022
[  572.188720] Backtrace: 
[  572.188720]  dump_backtrace from show_stack+0x20/0x24
[  572.188842]  r7:ef4675b8 r6:c29e3700 r5:60000153 r4:c1544714
[  572.188842]  show_stack from dump_stack_lvl+0x48/0x54
[  572.188903]  dump_stack_lvl from dump_stack+0x18/0x1c
[  572.188964]  r5:00000000 r4:00000000
[  572.188964]  dump_stack from __schedule_bug+0x74/0x84
[  572.189025]  __schedule_bug from __schedule+0xea0/0x1308
[  572.189086]  r5:00000000 r4:ef468bc0
[  572.189086]  __schedule from schedule_idle+0x2c/0x70
[  572.189147]  r10:c1e0b0f0 r9:c1e0b114 r8:c1e163d0 r7:ef4675b8 r6:c1e0b090 r5:00000001
[  572.189178]  r4:c29e3700
[  572.189178]  schedule_idle from do_idle+0x1a4/0x2c8
[  572.189239]  r5:00000001 r4:c29e3700
[  572.189270]  do_idle from cpu_startup_entry+0x28/0x2c
[  572.189331]  r10:00000000 r9:411fc092 r8:8020406a r7:c204c6b4 r6:c29e3700 r5:00000001
[  572.189331]  r4:00000099
[  572.189331]  cpu_startup_entry from secondary_start_kernel+0x190/0x224
[  572.189392]  secondary_start_kernel from 0x80301ea0
[  572.189453]  r7:c204c6b4 r6:10c0387d r5:00000055 r4:829cc06a

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
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Re: BUG: scheduling while atomic: swapper/1/0/0xffff0000

[Russell King (Oracle)]

On Thu, Jun 23, 2022 at 02:55:08PM +0200, Andreas Schwab wrote:
> I'm getting a lot of these messages on a panda board:
> 
> [  572.187805] BUG: scheduling while atomic: swapper/1/0/0xffff0000

This looks like a preempt count underflow of hard interrupts, which
means the backtrace won't be useful in tracking it down, sadly.

If it's a regression, bisecting might be the easiest way to find the
offending commit.

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