ci starts bisection 2024-08-18 21:36:43.705936839 +0000 UTC m=+129110.440081194 bisecting fixing commit since a12978712d9001b060bcc10eaae42ad5102abe2b building syzkaller on 757f06b1fadfe22cb3ac5f4f36e8e894eb78bb08 ensuring issue is reproducible on original commit a12978712d9001b060bcc10eaae42ad5102abe2b testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 3fdb88158f4937513a0c2e82e62e7f67cd9f102c6da2fb01fa5d6792243ab618 all runs: crashed: possible deadlock in __mmap_lock_do_trace_released representative crash: possible deadlock in __mmap_lock_do_trace_released, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 82be5c1027b419a27426332c6c8451f6faea86d35800dd13b22e48cdf6a47ac0 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [BUG KASAN ATOMIC_SLEEP HANG LEAK UBSAN], they are not needed kconfig minimization: base=4001 full=8043 leaves diff=2004 split chunks (needed=false): <2004> split chunk #0 of len 2004 into 5 parts testing without sub-chunk 1/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 36ec17f78ed80953e0656a664c905a34937a41927a992e35ef4970128915bc57 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9e964de0dc3f42aec779836cd2663699221dc1ad49f1d21126a361aab9e2a0ea all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a3ae37ddede8079cd8a91b4fd89df78c0d4c37caf57f25450a6465916bb7b193 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: db4186a5812a08e4165531920305428f16381d4b6e454e3ca287ad180fa7c4c5 all runs: OK false negative chance: 0.000 testing without sub-chunk 5/5 disabling configs for [HANG LEAK UBSAN BUG KASAN ATOMIC_SLEEP], they are not needed testing commit a12978712d9001b060bcc10eaae42ad5102abe2b gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: c613367cd0d03d304ddd3136791cdaca085c3cddc053af57f166784b0ee9e265 all runs: OK false negative chance: 0.000 minimized to 801 configs; suspects: [AF_RXRPC ARCH_ENABLE_MEMORY_HOTREMOVE ATM AX25 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USB_SERIAL_XSENS_MT USB_SEVSEG USB_SI470X USB_SI4713 USB_SIERRA_NET USB_SISUSBVGA USB_SL811_CS USB_SL811_HCD USB_SL811_HCD_ISO USB_SNP_CORE USB_SPEEDTOUCH USB_STORAGE_ALAUDA USB_STORAGE_CYPRESS_ATACB USB_STORAGE_DATAFAB USB_STORAGE_ENE_UB6250 USB_STORAGE_FREECOM USB_STORAGE_ISD200 USB_STORAGE_JUMPSHOT USB_STORAGE_KARMA USB_STORAGE_ONETOUCH USB_STORAGE_REALTEK USB_STORAGE_SDDR09 USB_STORAGE_SDDR55 USB_STORAGE_USBAT USB_STV06XX USB_TEST USB_TMC USB_TRANCEVIBRATOR USB_UAS USB_UEAGLEATM USB_ULPI_BUS USB_USBNET USB_USS720 USB_U_AUDIO USB_U_ETHER USB_U_SERIAL USB_VIDEO_CLASS USB_VIDEO_CLASS_INPUT_EVDEV USB_VL600 USB_WDM USB_XHCI_DBGCAP USB_XHCI_PLATFORM USB_XUSBATM USB_YUREX USERFAULTFD USERIO USERMODE_DRIVER USER_RETURN_NOTIFIER UVC_COMMON U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA VDPA_SIM VDPA_SIM_BLOCK VDPA_SIM_NET VDPA_USER VETH VFIO VFIO_DEVICE_CDEV VFIO_PCI VFIO_PCI_CORE VFIO_PCI_INTX VFIO_PCI_MMAP VFIO_VIRQFD VGASTATE VHOST VHOST_CROSS_ENDIAN_LEGACY VHOST_IOTLB VHOST_NET VHOST_RING VHOST_TASK VHOST_VDPA VHOST_VSOCK VIDEO VIDEOBUF2_CORE VIDEOBUF2_DMA_CONTIG VIDEOBUF2_DMA_SG VIDEOBUF2_MEMOPS VIDEOBUF2_V4L2 VIDEOBUF2_VMALLOC VIDEOMODE_HELPERS VIDEO_AU0828 VIDEO_AU0828_RC VIDEO_AU0828_V4L2 VIDEO_CS53L32A VIDEO_CX231XX VIDEO_CX231XX_ALSA VIDEO_CX231XX_DVB VIDEO_CX231XX_RC VIDEO_CX2341X VIDEO_CX25840 VIDEO_DEV VIDEO_EM28XX VIDEO_EM28XX_ALSA VIDEO_EM28XX_DVB VIDEO_EM28XX_RC VIDEO_EM28XX_V4L2 VIDEO_GO7007 VIDEO_GO7007_LOADER VIDEO_GO7007_USB VIDEO_GO7007_USB_S2250_BOARD VIDEO_HDPVR VIDEO_MSP3400 VIDEO_PVRUSB2 VIDEO_PVRUSB2_DVB VIDEO_PVRUSB2_SYSFS VIDEO_SAA711X VIDEO_STK1160 VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2_I2C VIDEO_V4L2_SUBDEV_API VIDEO_V4L2_TPG VIDEO_VICODEC VIDEO_VIM2M VIDEO_VIMC VIDEO_VIVID VIDEO_VIVID_CEC VIDEO_WM8775 VIPERBOARD_ADC VIRTIO_BALLOON VIRTIO_DMA_SHARED_BUFFER VIRTIO_MEM VIRTIO_MMIO VIRTIO_MMIO_CMDLINE_DEVICES VIRTIO_PMEM VIRTIO_VDPA VIRTIO_VSOCKETS VIRTIO_VSOCKETS_COMMON VIRT_WIFI VLAN_8021Q VLAN_8021Q_GVRP VLAN_8021Q_MVRP VMAP_PFN VMWARE_VMCI VMXNET3 VP_VDPA VSOCKETS VSOCKETS_DIAG VSOCKETS_LOOPBACK VSOCKMON VT_HW_CONSOLE_BINDING VXFS_FS VXLAN WANT_DEV_COREDUMP WEXT_CORE WEXT_PRIV WEXT_PROC WIREGUARD WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ADMTEK WLAN_VENDOR_PURELIFI WLAN_VENDOR_SILABS X86_SGX X86_SGX_KVM X86_USER_SHADOW_STACK X86_X2APIC X86_X32_ABI XDP_SOCKETS XDP_SOCKETS_DIAG XFRM_ESPINTCP XFRM_INTERFACE XFRM_IPCOMP XFRM_MIGRATE XFRM_OFFLOAD XFRM_STATISTICS XFRM_SUB_POLICY XFRM_USER_COMPAT XFS_FS XFS_POSIX_ACL XFS_QUOTA XFS_RT XOR_BLOCKS YENTA YENTA_ENE_TUNE YENTA_O2 YENTA_RICOH YENTA_TI YENTA_TOSHIBA ZEROPLUS_FF ZLIB_DEFLATE ZONEFS_FS ZONE_DEVICE ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_SHRINKER_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZSMALLOC] disabling configs for [ATOMIC_SLEEP HANG LEAK UBSAN BUG KASAN], they are not needed testing current HEAD fdf1c728fac541891ef1aa773bfd42728626769c testing commit fdf1c728fac541891ef1aa773bfd42728626769c gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9f53d666f0aa4455449546602e4ea1029873aa9e62eb6d6e4dc1333f38a5788d all runs: OK false negative chance: 0.000 # git bisect start fdf1c728fac541891ef1aa773bfd42728626769c a12978712d9001b060bcc10eaae42ad5102abe2b Bisecting: 7182 revisions left to test after this (roughly 13 steps) [280e36f0d5b997173d014c07484c03a7f7750668] nsfs: use cleanup guard determine whether the revision contains the guilty commit revision a12978712d9001b060bcc10eaae42ad5102abe2b crashed and is reachable testing commit 280e36f0d5b997173d014c07484c03a7f7750668 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 10392d40bbc23e8b13139311c21f22cb54caa0f7d85eeb2cab297da02badb72f all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good 280e36f0d5b997173d014c07484c03a7f7750668 Bisecting: 3566 revisions left to test after this (roughly 12 steps) [f4f92db4391285ef3a688cdad25d5c76db200a30] Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost determine whether the revision contains the guilty commit revision a12978712d9001b060bcc10eaae42ad5102abe2b crashed and is reachable testing commit f4f92db4391285ef3a688cdad25d5c76db200a30 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 63f83a90abc346db0db3171b8cd249fe6f4b92e04ea9f333ab1ee2b6ee006829 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good f4f92db4391285ef3a688cdad25d5c76db200a30 Bisecting: 1791 revisions left to test after this (roughly 11 steps) [9fa23750c6e591a6e095057ec07c81dddec0d72c] Merge tag 'landlock-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mic/linux determine whether the revision contains the guilty commit revision a12978712d9001b060bcc10eaae42ad5102abe2b crashed and is reachable testing commit 9fa23750c6e591a6e095057ec07c81dddec0d72c gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 72128cd81f9bcb22642f7cdb6c5f116a7583206537e6b73b731da57704ba971d all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good 9fa23750c6e591a6e095057ec07c81dddec0d72c Bisecting: 854 revisions left to test after this (roughly 10 steps) [527eff227d4321c6ea453db1083bc4fdd4d3a3e8] Merge tag 'mm-nonmm-stable-2024-07-21-15-07' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm determine whether the revision contains the guilty commit revision a12978712d9001b060bcc10eaae42ad5102abe2b crashed and is reachable testing commit 527eff227d4321c6ea453db1083bc4fdd4d3a3e8 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 425c404800061c7f1c7d3a23969621c025a763e1a81c6ab64f6f39c1d185c689 all runs: OK false negative chance: 0.000 # git bisect bad 527eff227d4321c6ea453db1083bc4fdd4d3a3e8 Bisecting: 511 revisions left to test after this (roughly 9 steps) [7846b618e0a4c3e08888099d1d4512722b39ca99] Merge tag 'rtc-6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux determine whether the revision contains the guilty commit revision a12978712d9001b060bcc10eaae42ad5102abe2b crashed and is reachable testing commit 7846b618e0a4c3e08888099d1d4512722b39ca99 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 28bce56d37381a157e5515fc6f9e8edd99acdc0df33e904e641b2cec3e19149a all runs: crashed: possible deadlock in __mmap_lock_do_trace_released representative crash: possible deadlock in __mmap_lock_do_trace_released, types: [LOCKDEP] # git bisect good 7846b618e0a4c3e08888099d1d4512722b39ca99 Bisecting: 255 revisions left to test after this (roughly 8 steps) [3a7a11a57e464a05bf2ae7ad1e28667890727ed8] readahead: disentangle async and sync readahead determine whether the revision contains the guilty commit checking the merge base d30d0e49da71de8df10bf3ff1b3de880653af562 no existing result, test the revision testing commit d30d0e49da71de8df10bf3ff1b3de880653af562 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 71f1b0222a7d5b141e3737a3c8b71a6081d0c94f4a1c6d429194350c5a578517 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] testing commit 3a7a11a57e464a05bf2ae7ad1e28667890727ed8 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: e8a55fca40f8fabc87a72a8b154cc74234563b2207d694f3c585fff3eabe4618 all runs: OK false negative chance: 0.000 # git bisect bad 3a7a11a57e464a05bf2ae7ad1e28667890727ed8 Bisecting: 127 revisions left to test after this (roughly 7 steps) [47179fe03588caa13a9bae642b058901709ddc55] mm/hugetlb_cgroup: prepare cftypes based on template determine whether the revision contains the guilty commit revision d30d0e49da71de8df10bf3ff1b3de880653af562 crashed and is reachable testing commit 47179fe03588caa13a9bae642b058901709ddc55 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 4bc56ed5c7b7d1f4aed86112b57f5e5c48816aa051b61eb6f77b071575b0068a all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good 47179fe03588caa13a9bae642b058901709ddc55 Bisecting: 63 revisions left to test after this (roughly 6 steps) [739820a6178b03b1b6b99a467c85e9e7146d51c1] maple_tree: modified return type of mas_wr_store_entry() determine whether the revision contains the guilty commit revision d30d0e49da71de8df10bf3ff1b3de880653af562 crashed and is reachable testing commit 739820a6178b03b1b6b99a467c85e9e7146d51c1 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: a9c85b63d0d17f746e944259842c350f73cadb4479be8fe98da91e4f2574516f all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good 739820a6178b03b1b6b99a467c85e9e7146d51c1 Bisecting: 31 revisions left to test after this (roughly 5 steps) [4d7b5a2cec6efb4dfd42a3fddf321d4d828e794d] mm: kfence: disable KMSAN when checking the canary determine whether the revision contains the guilty commit revision d30d0e49da71de8df10bf3ff1b3de880653af562 crashed and is reachable testing commit 4d7b5a2cec6efb4dfd42a3fddf321d4d828e794d gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: eb4307e6003a5a5290bd0df5a5837d17724cc02ae7270dc1ee1915a629c1d35c all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good 4d7b5a2cec6efb4dfd42a3fddf321d4d828e794d Bisecting: 15 revisions left to test after this (roughly 4 steps) [e0bebfd63af82e69419165770002420830fd32ec] s390/uaccess: add the missing linux/instrumented.h #include determine whether the revision contains the guilty commit revision 47179fe03588caa13a9bae642b058901709ddc55 crashed and is reachable testing commit e0bebfd63af82e69419165770002420830fd32ec gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 8776cf12b812bd71f1d5e2e164afa695a7b3b360b246e5f4449740ff9adb27bc all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good e0bebfd63af82e69419165770002420830fd32ec Bisecting: 7 revisions left to test after this (roughly 3 steps) [ee86814b0562f18255b55c5e6a01a022895994cf] mm/migrate: move NUMA hinting fault folio isolation + checks under PTL determine whether the revision contains the guilty commit revision 47179fe03588caa13a9bae642b058901709ddc55 crashed and is reachable testing commit ee86814b0562f18255b55c5e6a01a022895994cf gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 96cc7531f35dd2e590b1f95b1c2ba064ba3cc1dd4da0e04efa5381fda84e2919 all runs: OK false negative chance: 0.000 # git bisect bad ee86814b0562f18255b55c5e6a01a022895994cf Bisecting: 3 revisions left to test after this (roughly 2 steps) [b072880d69adf2e3dd3e4320f553cc8b9174fea6] kmsan: add missing __user tags determine whether the revision contains the guilty commit revision d30d0e49da71de8df10bf3ff1b3de880653af562 crashed and is reachable testing commit b072880d69adf2e3dd3e4320f553cc8b9174fea6 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 379e8ac642e4ed30cc5e77036903cabdeb10d9eff3678b6e9604b5f772ad7552 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good b072880d69adf2e3dd3e4320f553cc8b9174fea6 Bisecting: 1 revision left to test after this (roughly 1 step) [7d6be67cfdd4a53cea7147313ca13c531e3a470f] mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer determine whether the revision contains the guilty commit revision e0bebfd63af82e69419165770002420830fd32ec crashed and is reachable testing commit 7d6be67cfdd4a53cea7147313ca13c531e3a470f gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 664515c3a9bb581de7a9850c101c7373a906e33ef07b57ec38779d84e3ba2964 all runs: OK false negative chance: 0.000 # git bisect bad 7d6be67cfdd4a53cea7147313ca13c531e3a470f Bisecting: 0 revisions left to test after this (roughly 0 steps) [b1a80f4be7691a1ea007e24ebb3c8ca2e4a20f00] kmsan: do not pass NULL pointers as 0 determine whether the revision contains the guilty commit revision 47179fe03588caa13a9bae642b058901709ddc55 crashed and is reachable testing commit b1a80f4be7691a1ea007e24ebb3c8ca2e4a20f00 gcc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 kernel signature: 9120f81b3b875e71b0eac0b5ece711d0870d892ddaa84f9ef214996cebe96dc8 all runs: crashed: possible deadlock in __mmap_lock_do_trace_acquire_returned representative crash: possible deadlock in __mmap_lock_do_trace_acquire_returned, types: [LOCKDEP] # git bisect good b1a80f4be7691a1ea007e24ebb3c8ca2e4a20f00 7d6be67cfdd4a53cea7147313ca13c531e3a470f is the first bad commit commit 7d6be67cfdd4a53cea7147313ca13c531e3a470f Author: Tetsuo Handa Date: Fri Jun 21 10:08:41 2024 +0900 mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer Commit 2b5067a8143e ("mm: mmap_lock: add tracepoints around lock acquisition") introduced TRACE_MMAP_LOCK_EVENT() macro using preempt_disable() in order to let get_mm_memcg_path() return a percpu buffer exclusively used by normal, softirq, irq and NMI contexts respectively. Commit 832b50725373 ("mm: mmap_lock: use local locks instead of disabling preemption") replaced preempt_disable() with local_lock(&memcg_paths.lock) based on an argument that preempt_disable() has to be avoided because get_mm_memcg_path() might sleep if PREEMPT_RT=y. But syzbot started reporting inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. and inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. messages, for local_lock() does not disable IRQ. We could replace local_lock() with local_lock_irqsave() in order to suppress these messages. But this patch instead replaces percpu buffers with on-stack buffer, for the size of each buffer returned by get_memcg_path_buf() is only 256 bytes which is tolerable for allocating from current thread's kernel stack memory. Link: https://lkml.kernel.org/r/ef22d289-eadb-4ed9-863b-fbc922b33d8d@I-love.SAKURA.ne.jp Reported-by: syzbot Closes: https://syzkaller.appspot.com/bug?extid=40905bca570ae6784745 Fixes: 832b50725373 ("mm: mmap_lock: use local locks instead of disabling preemption") Signed-off-by: Tetsuo Handa Reviewed-by: Axel Rasmussen Cc: Nicolas Saenz Julienne Cc: Signed-off-by: Andrew Morton mm/mmap_lock.c | 175 +++++++-------------------------------------------------- 1 file changed, 20 insertions(+), 155 deletions(-) accumulated error probability: 0.00 culprit signature: 664515c3a9bb581de7a9850c101c7373a906e33ef07b57ec38779d84e3ba2964 parent signature: 9120f81b3b875e71b0eac0b5ece711d0870d892ddaa84f9ef214996cebe96dc8 revisions tested: 23, total time: 7h2m17.886039724s (build: 4h32m59.3395469s, test: 2h10m51.861441699s) first good commit: 7d6be67cfdd4a53cea7147313ca13c531e3a470f mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer recipients (to): ["akpm@linux-foundation.org" "axelrasmussen@google.com" "penguin-kernel@i-love.sakura.ne.jp"] recipients (cc): []