bisecting cause commit starting from 8a61716ff2ab23eddd1f7a05a075a374e4d0c3d4 building syzkaller on 7ff74a98320355d2a8c097333827b6565dbf64b9 testing commit 8a61716ff2ab23eddd1f7a05a075a374e4d0c3d4 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in ext4_file_write_iter run #2: crashed: INFO: rcu detected stall in sys_sendfile64 run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in ext4_file_write_iter run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in ext4_file_write_iter run #8: crashed: INFO: rcu detected stall in sys_sendfile64 run #9: crashed: INFO: rcu detected stall in ext4_file_write_iter testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in sys_sendfile64 run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in sys_sendfile64 run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in sys_sendfile64 run #9: crashed: INFO: rcu detected stall in corrupted testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in ext4_file_write_iter run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in ext4_file_write_iter run #5: crashed: INFO: rcu detected stall in ext4_file_write_iter run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: BUG: workqueue lockup testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in rw_verify_area run #1: crashed: INFO: rcu detected stall in ext4_file_write_iter run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in ext4_file_write_iter run #5: crashed: INFO: rcu detected stall in ext4_file_write_iter run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in ext4_file_write_iter run #8: crashed: INFO: rcu detected stall in ext4_file_write_iter run #9: crashed: INFO: rcu detected stall in rw_verify_area testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in ext4_file_write_iter run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in sys_sendfile64 run #3: crashed: INFO: rcu detected stall in sys_sendfile64 run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in sys_sendfile64 run #6: crashed: INFO: rcu detected stall in sys_sendfile64 run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in sys_sendfile64 testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in ext4_file_write_iter run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in ext4_file_write_iter run #2: crashed: INFO: rcu detected stall in ext4_file_write_iter run #3: crashed: INFO: rcu detected stall in ext4_file_write_iter run #4: crashed: INFO: rcu detected stall in ext4_file_write_iter run #5: crashed: INFO: rcu detected stall in ext4_file_write_iter run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in rw_verify_area testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in ext4_file_write_iter run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in ext4_file_write_iter run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in ext4_file_write_iter run #9: crashed: INFO: rcu detected stall in ext4_file_write_iter testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in ext4_file_write_iter run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in corrupted testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in ext4_file_write_iter run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: BUG: workqueue lockup testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: BUG: workqueue lockup run #9: crashed: INFO: rcu detected stall in corrupted testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in ext4_file_write_iter run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: BUG: workqueue lockup run #8: crashed: INFO: rcu detected stall in ext4_file_write_iter run #9: crashed: INFO: rcu detected stall in ext4_file_write_iter testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: BUG: workqueue lockup run #8: crashed: BUG: workqueue lockup run #9: crashed: INFO: rcu detected stall in ext4_file_write_iter testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in ext4_file_write_iter run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in ext4_file_write_iter run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: BUG: workqueue lockup run #9: crashed: BUG: workqueue lockup testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in ext4_file_write_iter run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in corrupted run #9: crashed: INFO: rcu detected stall in ext4_file_write_iter testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in ext4_file_write_iter run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: BUG: workqueue lockup run #9: crashed: BUG: workqueue lockup testing release v4.5 testing commit b562e44f507e863c6792946e4e1b1449fbbac85d with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in ext4_file_write_iter run #2: crashed: INFO: rcu detected stall in ext4_file_write_iter run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: crashed: INFO: rcu detected stall in ext4_file_write_iter run #9: crashed: INFO: rcu detected stall in ext4_file_write_iter testing release v4.4 testing commit afd2ff9b7e1b367172f18ba7f693dfb62bdcb2dc with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: unregister_netdevice: waiting for DEV to become free run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: crashed: INFO: rcu detected stall in corrupted run #8: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "12167" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/usr/local/google/home/dvyukov/syzkaller/ci-bisect2/jobs/linux/workdir/image/key" "/tmp/syz-executor735967382" "root@localhost:/syz-executor735967382"]: exit status 1 ssh: connect to host localhost port 12167: Connection timed out lost connection run #9: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "36136" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/usr/local/google/home/dvyukov/syzkaller/ci-bisect2/jobs/linux/workdir/image/key" "/tmp/syz-executor986993405" "root@localhost:/syz-executor986993405"]: exit status 1 ssh: connect to host localhost port 36136: Connection timed out lost connection testing release v4.3 testing commit 6a13feb9c82803e2b815eca72fa7a9f5561d7861 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in corrupted run #7: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "40600" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/usr/local/google/home/dvyukov/syzkaller/ci-bisect2/jobs/linux/workdir/image/key" "/tmp/syz-executor321187370" "root@localhost:/syz-executor321187370"]: exit status 1 ssh: connect to host localhost port 40600: Connection timed out lost connection run #8: OK run #9: OK testing release v4.2 testing commit 64291f7db5bd8150a74ad2036f1037e6a0428df2 with gcc (GCC) 5.5.0 all runs: OK # git bisect start v4.3 v4.2 Bisecting: 6618 revisions left to test after this (roughly 13 steps) [807249d3ada1ff28a47c4054ca4edd479421b671] Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus testing commit 807249d3ada1ff28a47c4054ca4edd479421b671 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 807249d3ada1ff28a47c4054ca4edd479421b671 Bisecting: 3462 revisions left to test after this (roughly 12 steps) [102178108e2246cb4b329d3fb7872cd3d7120205] Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc testing commit 102178108e2246cb4b329d3fb7872cd3d7120205 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 102178108e2246cb4b329d3fb7872cd3d7120205 Bisecting: 1606 revisions left to test after this (roughly 11 steps) [c8192ba416397ad6ce493f186da40767ce086c3b] Merge tag 'for-v4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply testing commit c8192ba416397ad6ce493f186da40767ce086c3b with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in ext4_file_write_iter run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad c8192ba416397ad6ce493f186da40767ce086c3b Bisecting: 796 revisions left to test after this (roughly 10 steps) [13d825edd4441dd3453de58d1bd2ade44d5ad2ab] staging: speakup: Fix warning reported by checkpatch testing commit 13d825edd4441dd3453de58d1bd2ade44d5ad2ab with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 13d825edd4441dd3453de58d1bd2ade44d5ad2ab Bisecting: 397 revisions left to test after this (roughly 9 steps) [bc4f2cc90d214e81bb75c5b63a8c919779f32a6a] staging: rtl8192e: Rename rtl8192_commit testing commit bc4f2cc90d214e81bb75c5b63a8c919779f32a6a with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in ext4_file_write_iter run #2: crashed: unregister_netdevice: waiting for DEV to become free run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad bc4f2cc90d214e81bb75c5b63a8c919779f32a6a Bisecting: 198 revisions left to test after this (roughly 8 steps) [f99b71be37dd88e7b2f4a7c227da6c4f71cd8fa4] staging: vme_user: fix NULL comparison style testing commit f99b71be37dd88e7b2f4a7c227da6c4f71cd8fa4 with gcc (GCC) 5.5.0 run #0: boot failed: can't ssh into the instance run #1: boot failed: BUG: unable to handle kernel NULL pointer dereference in arch_pick_mmap_layout run #2: boot failed: BUG: unable to handle kernel NULL pointer dereference in arch_pick_mmap_layout run #3: boot failed: WARNING in fpu__clear run #4: boot failed: BUG: unable to handle kernel NULL pointer dereference in arch_pick_mmap_layout run #5: boot failed: WARNING in fpu__clear run #6: boot failed: WARNING in fpu__clear run #7: boot failed: WARNING in fpu__clear run #8: boot failed: WARNING in fpu__clear run #9: boot failed: WARNING in fpu__clear # git bisect skip f99b71be37dd88e7b2f4a7c227da6c4f71cd8fa4 Bisecting: 198 revisions left to test after this (roughly 8 steps) [1f0622de0d1fb7de187c7cf729971d56def7814e] staging: vme_user: fix kmalloc style testing commit 1f0622de0d1fb7de187c7cf729971d56def7814e with gcc (GCC) 5.5.0 run #0: boot failed: BUG: unable to handle kernel NULL pointer dereference in arch_pick_mmap_layout run #1: boot failed: BUG: unable to handle kernel NULL pointer dereference in arch_pick_mmap_layout run #2: boot failed: BUG: unable to handle kernel NULL pointer dereference in arch_pick_mmap_layout run #3: boot failed: BUG: unable to handle kernel NULL pointer dereference in arch_pick_mmap_layout run #4: boot failed: BUG: unable to handle kernel NULL pointer dereference in arch_pick_mmap_layout run #5: boot failed: WARNING in fpu__clear run #6: boot failed: WARNING in fpu__clear run #7: boot failed: BUG: unable to handle kernel NULL pointer dereference in arch_pick_mmap_layout run #8: boot failed: BUG: unable to handle kernel NULL pointer dereference in arch_pick_mmap_layout run #9: boot failed: WARNING in fpu__clear # git bisect skip 1f0622de0d1fb7de187c7cf729971d56def7814e Bisecting: 198 revisions left to test after this (roughly 8 steps) [ed15e8880fc3d8d52bc02a02521054bfcb26264a] Merge 4.2-rc3 into staging-next testing commit ed15e8880fc3d8d52bc02a02521054bfcb26264a with gcc (GCC) 5.5.0 all runs: OK # git bisect good ed15e8880fc3d8d52bc02a02521054bfcb26264a Bisecting: 53 revisions left to test after this (roughly 6 steps) [12656e2b8c308d86dbb3b9167db0309f27f90d4f] staging: rtl8192e: Rename cmpk_message_handle_tx testing commit 12656e2b8c308d86dbb3b9167db0309f27f90d4f with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 12656e2b8c308d86dbb3b9167db0309f27f90d4f Bisecting: 27 revisions left to test after this (roughly 5 steps) [705a31369845d7ad522dc9bce6ca430831ff0454] staging: rtl8188eu: check for kzalloc failure testing commit 705a31369845d7ad522dc9bce6ca430831ff0454 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in corrupted run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 705a31369845d7ad522dc9bce6ca430831ff0454 Bisecting: 13 revisions left to test after this (roughly 4 steps) [f0fb87fba09473e6b39e351c7da59b4faa9a4fcf] staging: vt6655: Fix tagSRxDesc -> buff_addr type testing commit f0fb87fba09473e6b39e351c7da59b4faa9a4fcf with gcc (GCC) 5.5.0 all runs: OK # git bisect good f0fb87fba09473e6b39e351c7da59b4faa9a4fcf Bisecting: 6 revisions left to test after this (roughly 3 steps) [d258bf054a446c77a9cb7fa31dc4518ba2f1861d] staging: comedi: drivers: pcl816.c remove leading space testing commit d258bf054a446c77a9cb7fa31dc4518ba2f1861d with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in ext4_file_write_iter run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad d258bf054a446c77a9cb7fa31dc4518ba2f1861d Bisecting: 3 revisions left to test after this (roughly 2 steps) [1cf0a47c8c4986b8fa946156a19f7b02dc303a43] staging: vt6655: fix tagTDES1 -> wReqCount type testing commit 1cf0a47c8c4986b8fa946156a19f7b02dc303a43 with gcc (GCC) 5.5.0 run #0: crashed: unregister_netdevice: waiting for DEV to become free run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 1cf0a47c8c4986b8fa946156a19f7b02dc303a43 Bisecting: 0 revisions left to test after this (roughly 1 step) [7135d9a76f787f089faad0e08bdef259cb019d64] staging: vt6655: Fix wReqCount to __le16 testing commit 7135d9a76f787f089faad0e08bdef259cb019d64 with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in ext4_file_write_iter run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 7135d9a76f787f089faad0e08bdef259cb019d64 Bisecting: 0 revisions left to test after this (roughly 0 steps) [f1e3e92135202ff3d95195393ee62808c109208c] staging: vt6655: fix tagSRxDesc -> next_desc type testing commit f1e3e92135202ff3d95195393ee62808c109208c with gcc (GCC) 5.5.0 run #0: crashed: INFO: rcu detected stall in ext4_file_write_iter run #1: crashed: unregister_netdevice: waiting for DEV to become free run #2: crashed: INFO: rcu detected stall in corrupted run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad f1e3e92135202ff3d95195393ee62808c109208c f1e3e92135202ff3d95195393ee62808c109208c is the first bad commit commit f1e3e92135202ff3d95195393ee62808c109208c Author: Malcolm Priestley Date: Wed Jul 22 19:16:42 2015 +0100 staging: vt6655: fix tagSRxDesc -> next_desc type Should always be __le32 Signed-off-by: Malcolm Priestley Signed-off-by: Greg Kroah-Hartman drivers/staging/vt6655/desc.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) revisions tested: 35, total time: 5h55m34.301868644s (build: 1h34m13.602937847s, test: 4h15m55.981213826s) first bad commit: f1e3e92135202ff3d95195393ee62808c109208c staging: vt6655: fix tagSRxDesc -> next_desc type cc: ["devel@driverdev.osuosl.org" "forest@alittletooquiet.net" "gregkh@linuxfoundation.org" "linux-kernel@vger.kernel.org" "tvboxspy@gmail.com"] crash: INFO: rcu detected stall in corrupted bridge0: port 1(bridge_slave_0) entered forwarding state bridge0: port 2(bridge_slave_1) entered forwarding state bridge0: port 1(bridge_slave_0) entered forwarding state bridge0: port 2(bridge_slave_1) entered forwarding state hrtimer: interrupt took 18386 ns INFO: rcu_preempt detected stalls on CPUs/tasks: Tasks blocked on level-0 rcu_node (CPUs 0-1): P2172 (detected by 0, t=10502 jiffies, g=361, c=360, q=54) kworker/u5:1 R running task 12984 2172 2 0x00000000 Workqueue: writeback wb_workfn (flush-8:0) ffff88003e06b6c8 ffffffff825a39b5 ffff88003ea68000 ffff88003d4bc1c0 ffff88003db12040 ffff88003e06b6b8 ffff88003e06c000 ffff88003ac5a9b8 ffff88003ea68000 0000000000000000 ffff88007dfc28b0 ffff88003e06b6e8 Call Trace: [] preempt_schedule_irq+0x5b/0xa0 kernel/sched/core.c:3217 [] retint_kernel+0x1b/0x2d [] clear_page_dirty_for_io+0x180/0x2e0 mm/page-writeback.c:2689 [] mpage_submit_page+0x46/0x80 fs/ext4/inode.c:1867 [] mpage_process_page_bufs+0xf6/0x100 fs/ext4/inode.c:1973 [] mpage_prepare_extent_to_map+0x1de/0x2d0 fs/ext4/inode.c:2351 [] ext4_writepages+0x548/0x1310 fs/ext4/inode.c:2505 [] do_writepages+0x1c/0x30 mm/page-writeback.c:2332 [] __writeback_single_inode+0x71/0xb70 fs/fs-writeback.c:1258 [] writeback_sb_inodes+0x2f0/0x6c0 fs/fs-writeback.c:1515 [] __writeback_inodes_wb+0x87/0xb0 fs/fs-writeback.c:1561 [] wb_writeback+0x390/0x7b0 fs/fs-writeback.c:1665 [] wb_check_old_data_flush fs/fs-writeback.c:1779 [inline] [] wb_do_writeback fs/fs-writeback.c:1822 [inline] [] wb_workfn+0x440/0x910 fs/fs-writeback.c:1851 [] process_one_work+0x214/0x860 kernel/workqueue.c:2032 [] worker_thread+0x49/0x450 kernel/workqueue.c:2164 [] kthread+0xea/0x100 drivers/block/aoe/aoecmd.c:1312 [] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:526 kworker/u5:1 R running task 12984 2172 2 0x00000000 Workqueue: writeback wb_workfn (flush-8:0) ffff88003e06b6c8 ffffffff825a39b5 ffff88003ea68000 ffff88003d4bc1c0 ffff88003db12040 ffff88003e06b6b8 ffff88003e06c000 ffff88003ac5a9b8 ffff88003ea68000 0000000000000000 ffff88007dfc28b0 ffff88003e06b6e8 Call Trace: [] preempt_schedule_irq+0x5b/0xa0 kernel/sched/core.c:3217 [] retint_kernel+0x1b/0x2d [] clear_page_dirty_for_io+0x180/0x2e0 mm/page-writeback.c:2689 [] mpage_submit_page+0x46/0x80 fs/ext4/inode.c:1867 [] mpage_process_page_bufs+0xf6/0x100 fs/ext4/inode.c:1973 [] mpage_prepare_extent_to_map+0x1de/0x2d0 fs/ext4/inode.c:2351 [] ext4_writepages+0x548/0x1310 fs/ext4/inode.c:2505 [] do_writepages+0x1c/0x30 mm/page-writeback.c:2332 [] __writeback_single_inode+0x71/0xb70 fs/fs-writeback.c:1258 [] writeback_sb_inodes+0x2f0/0x6c0 fs/fs-writeback.c:1515 [] __writeback_inodes_wb+0x87/0xb0 fs/fs-writeback.c:1561 [] wb_writeback+0x390/0x7b0 fs/fs-writeback.c:1665 [] wb_check_old_data_flush fs/fs-writeback.c:1779 [inline] [] wb_do_writeback fs/fs-writeback.c:1822 [inline] [] wb_workfn+0x440/0x910 fs/fs-writeback.c:1851 [] process_one_work+0x214/0x860 kernel/workqueue.c:2032 [] worker_thread+0x49/0x450 kernel/workqueue.c:2164 [] kthread+0xea/0x100 drivers/block/aoe/aoecmd.c:1312 [] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:526 rcu_preempt kthread starved for 4488 jiffies! g361 c360 f0x0